**As** an admin
**I would like** to quickly and programmatically populate and update the available options of custom fields of type Begin of the insertionList, Hierarchy, and Weighted item listEnd of the insertion Begin of the deletion List (and in future, once that custom field type exists, of type Hierarchy)End of the deletion via Begin of the insertionAPIEnd of the insertion Begin of the deletion API,End of the deletion
**so that** I can have a different system managing those options.

Example:

An HR management system holds the information of a company's organizational structure and wants to mirror that structure into OpenProject so that it can be used for filtering work packages, projects and users.