To be honest I'm not sure how this is done, but have you tried referring to this guide?
I am attempting to use the CreateFromTemplateMessage to create a project with a number of sub-items in a template via an API call. In the UI when creating a custom Action, I have the option to "Make Owner for all child Work Items" when creating the project. I need to know how to access this functionality from the API
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Moving to the developer forum.