How to transfer an add-in(?) from one MS Office to another?

Question

Microsoft Office

Greetings!
There is a PC with MS Office 2014 installed.
It has something like an add-on or extension: its own named item has been added to the "file" menu, it has its own buttons for creating documents according to a template and other specific actions.
For some reason, the "add-ons" menu is empty. Of course, there is no source code for this extension.
Is it possible to transfer this functionality to another PC by copying files / folders from the first one directly over the "office" distribution installed there?
What specific files / folders do you recommend to transfer?
Thanks to.