> ## Documentation Index
> Fetch the complete documentation index at: https://replyke-feat-push-rich-payload-fields.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Sub-List

> Create a new sub-list under a parent list

Creates a new sub-list (nested list) under the specified parent list.

## Path Parameters

<ParamField path="listId" type="string" required>
  ID of the parent list to nest under
</ParamField>

## Body Parameters

<ParamField body="listName" type="string" required>
  Name of the new sub-list
</ParamField>

## Response

<ResponseField name="id" type="string">
  Unique list identifier
</ResponseField>

<ResponseField name="projectId" type="string">
  Project identifier
</ResponseField>

<ResponseField name="userId" type="string">
  ID of the user who owns the list
</ResponseField>

<ResponseField name="name" type="string">
  Name of the list
</ResponseField>

<ResponseField name="parentId" type="string">
  ID of the parent list
</ResponseField>

<ResponseField name="entityIds" type="array">
  Array of entity IDs saved in this list
</ResponseField>

<ResponseField name="createdAt" type="string">
  Creation timestamp in ISO 8601 format
</ResponseField>

<ResponseField name="updatedAt" type="string">
  Last update timestamp in ISO 8601 format
</ResponseField>

## Error Responses

<AccordionGroup>
  <Accordion title="Missing Parameters - 400 Bad Request">
    ```json theme={null}
    {
      "error": "Missing required parameters in request body",
      "code": "list/missing-parameters"
    }
    ```
  </Accordion>

  <Accordion title="Invalid Parent List - 400 Bad Request">
    ```json theme={null}
    {
      "error": "Invalid parent list ID for sub-list",
      "code": "list/invalid-parent"
    }
    ```
  </Accordion>

  <Accordion title="Server Error - 500 Internal Server Error">
    ```json theme={null}
    {
      "error": "Server error",
      "code": "list/server-error",
      "details": "<Error message>"
    }
    ```
  </Accordion>
</AccordionGroup>

***

## Notes

* The authenticated user's ID is automatically associated with the new list.
* Only existing parent lists can be used for sub-list creation.
* The response includes the populated list details.