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

# Sub-workflow triggering

> If you're onboarding a new customer and part of the workflow is to get some legal paperwork ready. Instead of doing that as part of the entire customer onboarding process flow you can trigger a sub-workflow.

## Before you begin

* In Next Matter, go to **Workflows**, and create the first workflow. You will embed the sub-workflow into this workflow.
* Have your **API key** at hand. If you don't have it, contact your organization admin, or, if you're an admin, generate the key in Next Matter by going to **Company > Next Matter API keys**.
* Note down the ID of the workflow that will be triggered with the first workflow. You can get the ID by clicking the follow-up workflow and copying the number from the URL in your browser.

## Create and embed the sub-workflow

1. In Next Matter, go to **Workflows**.
2. Click **Create workflow** and create the workflow that will become the sub-workflow.
3. Note down the ID of the workflow. You can get the ID by clicking the follow-up workflow and copying the number from the URL in your browser.

<Frame>
  <img src="https://mintcdn.com/nextmatter/I7XEPsBmVpUZVtva/images/docs/294e684-workflow_ID.png?fit=max&auto=format&n=I7XEPsBmVpUZVtva&q=85&s=6bf72307603a0db9bc682e1d62e269de" alt="Image of the workflow ID in the URL" width="1456" height="399" data-path="images/docs/294e684-workflow_ID.png" />
</Frame>

4. Open the main workflow you created.
5. In the place where the sub-workflow should be started add an **Integration > Custom integration** step.
6. Click **Settings** and enter the following data:

* **Method**: POST
* **URL**: `https://core.nextmatter.com/api/instances/`
* **Headers**: Content-type: `application/json`
* **Headers**: Authorization: `Your_NextMatter_API_Key`
* **Body**:
  <CodeGroup>
    ```Text JSON theme={null}
    {
        "process": "https://core.nextmatter.com/api/processes/MAIN_WORKFLOW_ID/",
        "name": "{Instance ID}- Sub-workflow"
    }
    ```
  </CodeGroup>

7. Save your changes.