---
title: "Changes to Insert an instance of a part, sketch, assembly, or Part Studio into an assembly."
method: POST
path: "/assemblies/d/{did}/w/{wid}/e/{eid}/instances"
---

# Changes to Insert an instance of a part, sketch, assembly, or Part Studio into an assembly.

`POST /assemblies/d/{did}/w/{wid}/e/{eid}/instances`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 1 of 12 revisions.

- **2026-09-19** `c16acb88e3ea`: 1 info

## Changes

- **2026-09-19** `c16acb88e3ea`: 1 info
  - added the new optional request property `isFixed`

---

[Operation](https://skmtc.dev/onshape/apis/onshape-rest-api/docs/assemblies/d/:did/w/:wid/e/:eid/instances/post.md) - [API](https://skmtc.dev/onshape/apis/onshape-rest-api.md) - [Page](https://skmtc.dev/onshape/apis/onshape-rest-api/changes/assemblies/d/:did/w/:wid/e/:eid/instances/post)