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Add an association to a custom object schema

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Add an association to a custom object schema

with HubSpot
Works with AI assistants

Use HubSpot: its Hubspot Advanced API lets you add an association to a custom object schema in a single step (POST /crm-object-schemas/2026-09/schemas/{objectType}/associations). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.

  • How do I let records of my custom object schema associate with contacts or deals?
  • Can I name the association I add between two object types in a schema?
Say it to your AI assistant
  • Add an association to the {objectType} object schema from {fromObjectTypeId} to {toObjectTypeId}.
  • Define a schema association called {name} linking {fromObjectTypeId} to {toObjectTypeId} on {objectType}.
For your developer

POST /crm-object-schemas/2026-09/schemas/{objectType}/associations in Hubspot Advanced API. Full spec on APIs.io.

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