---
title: "Create ProcedureMethodExecutionInstanceAssociation"
method: POST
path: "/api/v3/procedure-method-execution-instance-association"
tags: ["Procedure Method Execution Instance Association"]
---

# Create ProcedureMethodExecutionInstanceAssociation

`POST /api/v3/procedure-method-execution-instance-association`

## Request

- Base URL: `https://{tenant_name}.benchling.com`
- URL: `https://{tenant_name}.benchling.com/api/v3/procedure-method-execution-instance-association`
- Auth: HTTP bearer

Create ProcedureMethodExecutionInstanceAssociation.

## Headers

- `EARLY-ACCESS` string

## Request body

- ProcedureMethodExecutionInstanceAssociationUpsert
  - `sourceProcedureMethodExecutionInstanceId` string, required
  - `targetProcedureMethodExecutionInstanceId` string, required

## Response `201`

Created

- ProcedureMethodExecutionInstanceAssociation: Links two method execution instances across procedure runs to represent an intended connection within a study. This allows scientists to coordinate their analyses across runs, even when the flowchart structure may differ. ## Product mapping - In the Benchling UI, this represents an explicit **link/association between executed methods** used for unit-operation linking **across runs**. - For linking **within a single run** (for example, split pooling), use the `ProcedureRunReplicateEdge` flowchart links. - The association operates on runtime instances (`ProcedureMethodExecutionInstance`), not template method definitions.
  - `__typename` string
  - `archiveReason` string, nullable
  - `archived` boolean
  - `createdAt` string, datetime
  - `id` string
  - `modifiedAt` string, datetime
  - `sourceProcedureMethodExecutionInstance` ProcedureMethodExecutionInstanceRef
    - `__typename` string
    - `id` string, api_id
  - `targetProcedureMethodExecutionInstance` ProcedureMethodExecutionInstanceRef
    - `__typename` string
    - `id` string, api_id

## Other responses

- `400`: Bad Request
- `403`: Forbidden
- `404`: Not Found
- `409`: Conflict
- `429`: Too Many Requests
- `500`: Internal Server Error

---

[API](https://skmtc.dev/benchling/apis/benchling-api.md) - [All operations](https://skmtc.dev/benchling/apis/benchling-api/llms.txt) - [OpenAPI document](https://skmtc.dev/benchling/apis/benchling-api/revisions/c9f087b98b8b?raw)