> ## Documentation Index
> Fetch the complete documentation index at: https://developers.hubspot.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

---
id: 1f0fe87a-6621-4b1f-ab54-3322856a2483
---

# Add memberships

> Add memberships to a specified list from another source list. This operation is useful for consolidating list memberships by transferring members from one list to another. The endpoint does not return any content upon successful execution.

export const ScopesList = ({scopes = [], description = "This API requires one of the following scopes:"}) => {
  if (!scopes || scopes.length === 0) {
    return null;
  }
  const sortedScopes = scopes.sort((a, b) => a.localeCompare(b));
  return <div>
      <div className="text-sm mb-2">{description}</div>
      <div>
        {sortedScopes.map((scope, index) => <div key={index}>
            <code>
              <span className="text-xs">{scope}</span>
            </code>
          </div>)}
      </div>
    </div>;
};

export const SupportedProducts = ({marketing, sales, service, cms, data, commerce, crm, marketingLevel, salesLevel, serviceLevel, cmsLevel, dataLevel, commerceLevel, crmLevel}) => {
  const translations = {
    description: "Requires one of the following products or higher.",
    productNames: {
      marketing: "Marketing Hub",
      sales: "Sales Hub",
      service: "Service Hub",
      cms: "Content Hub",
      data: "Data Hub",
      commerce: "Revenue Hub",
      crm: "Smart CRM"
    },
    tiers: {
      free: "Free",
      starter: "Starter",
      professional: "Professional",
      enterprise: "Enterprise"
    }
  };
  const translateTier = tier => {
    if (!tier) return '';
    const lowerTier = tier.toLowerCase();
    return translations.tiers[lowerTier] || tier;
  };
  const products = [{
    name: marketing ? translations.productNames.marketing : '',
    level: translateTier(marketingLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/MarketingHub.svg",
    alt: "Marketing Hub"
  }, {
    name: sales ? translations.productNames.sales : '',
    level: translateTier(salesLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/SalesHub.svg",
    alt: "Sales Hub"
  }, {
    name: service ? translations.productNames.service : '',
    level: translateTier(serviceLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/ServiceHub.svg",
    alt: "Service Hub"
  }, {
    name: cms ? translations.productNames.cms : '',
    level: translateTier(cmsLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/ContentHub.svg",
    alt: "Content Hub"
  }, {
    name: data ? translations.productNames.data : '',
    level: translateTier(dataLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/DataHub.svg",
    alt: "Data Hub"
  }, {
    name: commerce ? translations.productNames.commerce : '',
    level: translateTier(commerceLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base/subscription_key_icons/commerce_icon.svg",
    alt: "Revenue Hub"
  }, {
    name: crm ? translations.productNames.crm : '',
    level: translateTier(crmLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/SmartCRM.svg",
    alt: "Smart CRM"
  }].filter(product => product.name && product.level);
  if (products.length === 0) return null;
  return <div>
      <div className="text-sm mb-2">{translations.description}</div>
      <div className={`grid ${products.length === 1 ? 'grid-cols-1' : 'grid-cols-2'} gap-1.5`}>
        {products.map((product, index) => <div key={index} style={{
    display: 'flex',
    alignItems: 'center'
  }}>
            <img src={product.icon} alt={product.alt} className="w-3.5 h-3.5 mr-1.5 mt-2.5 mb-2.5 flex-shrink-0 align-middle" />
            <span className="font-medium mr-1 text-sm">{product.name} -</span>
            <span className="text-sm">{product.level}</span>
          </div>)}
      </div>
    </div>;
};

<AccordionGroup>
  <Accordion title="Supported products" defaultOpen="true" icon="cubes">
    <SupportedProducts marketing={true} sales={true} service={true} cms={true} marketingLevel="FREE" salesLevel="FREE" serviceLevel="FREE" cmsLevel="FREE" />
  </Accordion>

  <Accordion title="Required Scopes" icon="key">
    <ScopesList
      scopes={[
  'cms.membership.access_groups.write',
  'crm.lists.read',
  'crm.lists.write'
]}
    />
  </Accordion>
</AccordionGroup>


## OpenAPI

````yaml specs/2026-09-beta/crm-lists-v2026-09-beta.json PUT /crm/lists/2026-09-beta/{listId}/memberships/add-from/{sourceListId}
openapi: 3.0.1
info:
  title: CRM Lists
  description: Basepom for all HubSpot Projects
  version: 2026-09-beta
  x-hubspot-product-tier-requirements:
    marketing: FREE
    sales: FREE
    service: FREE
    cms: FREE
    commerce: FREE
    crmHub: FREE
    dataHub: FREE
servers:
  - url: https://api.hubapi.com
security: []
tags:
  - name: Basic
  - name: Batch
  - name: Search
paths:
  /crm/lists/2026-09-beta/{listId}/memberships/add-from/{sourceListId}:
    put:
      tags:
        - Basic
      summary: Add memberships
      description: >-
        Add memberships to a specified list from another source list. This
        operation is useful for consolidating list memberships by transferring
        members from one list to another. The endpoint does not return any
        content upon successful execution.
      operationId: put-/crm/lists/2026-09-beta/{listId}/memberships/add-from/{sourceListId}
      parameters:
        - name: listId
          in: path
          description: >-
            The unique identifier of the target list to which memberships will
            be added.
          required: true
          style: simple
          explode: false
          schema:
            type: string
        - name: sourceListId
          in: path
          description: >-
            The unique identifier of the source list from which memberships will
            be transferred.
          required: true
          style: simple
          explode: false
          schema:
            type: string
      responses:
        '204':
          description: No content
          content: {}
        default:
          $ref: '#/components/responses/Error'
          description: ''
      security:
        - oauth2:
            - cms.membership.access_groups.write
            - crm.lists.read
        - oauth2:
            - crm.lists.read
            - crm.lists.write
components:
  responses:
    Error:
      description: An error occurred.
      content:
        '*/*':
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      required:
        - category
        - correlationId
        - message
      type: object
      properties:
        category:
          type: string
          description: A string indicating the category of the error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of key-value pairs.
          example: >-
            {invalidPropertyName=[propertyValue], missingScopes=[scope1,
            scope2]}
        correlationId:
          type: string
          description: >-
            A unique identifier for the error instance, used for tracking and
            debugging purposes.
          format: uuid
          example: aeb5f871-7f07-4993-9211-075dc63e7cbf
        errors:
          type: array
          description: >-
            An array of ErrorDetail objects, each providing additional
            information about specific errors that occurred.
          items:
            $ref: '#/components/schemas/ErrorDetail'
        links:
          type: object
          additionalProperties:
            type: string
          description: >-
            An object containing related links, represented as a map of link
            names to URLs.
        message:
          type: string
          description: A string that provides a human-readable description of the error.
          example: An error occurred
        subCategory:
          type: string
          description: >-
            An object representing a more specific classification of the error
            within its category.
      example:
        message: Invalid input (details will vary based on the error)
        correlationId: aeb5f871-7f07-4993-9211-075dc63e7cbf
        category: VALIDATION_ERROR
        links:
          knowledge-base: https://www.hubspot.com/products/service/knowledge-base
    ErrorDetail:
      required:
        - message
      type: object
      properties:
        code:
          type: string
          description: >-
            A string representing a specific error code that identifies the type
            of error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of strings to arrays of strings, which can include specific
            parameters or values related to the error.
          example: '{missingScopes=[scope1, scope2]}'
        in:
          type: string
          description: >-
            A string indicating the location where the error occurred, such as
            'query', 'header', or 'body'.
        message:
          type: string
          description: A string containing a human-readable description of the error.
        subCategory:
          type: string
          description: >-
            An object providing additional categorization of the error, which
            may contain further details.
  securitySchemes:
    oauth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://app.hubspot.com/oauth/authorize
          tokenUrl: https://api.hubapi.com/oauth/v1/token
          scopes:
            cms.membership.access_groups.write: ''
            crm.lists.read: ''
            crm.lists.write: ''

````