is there a way to add a word add in to the document out of another word add in?
Probably there's a way to add via editing the Custom XML or something?
This is a great idea, however this is not possible today. Make sure to vote for an existing request or add a new one in our UserVoice Channel. https://officespdev.uservoice.com/forums/224641-feature-requests-and-feedback/category/163566-add-in-word