Hi @Steve_Wiles,
As you’ll see in the docs for the duplicate-project endpoint, there’s no capability to specify new notes (i.e. a description) as part of that call.
You’ll need to duplicate the project, which will return you the duplication job, then query that job by ID periodically (I do it every 10 seconds) until you get a completion response, which response will have the ID of the new project, then update that project to add the description.
The docs aren’t too expansive on project duplication but there’s a little more info here.