How can i duplicate VSTA ProjectAddin

How can i duplicate VSTA ProjectAddin

Hello,
i've 25 ZenOn projects in the editor.
i've a VSTA ProjectAddin in one of this project with many .cs files.
i want to duplicate the VSTA in all the projects.

is it possible to duplicate quickly the VSTA project? (by copying files? import/export? other?)
OR
do I have to go into each project and manually create all cs files in the editor VSTA project?
thx for ur help.

This is a migrated post! Originally posted on 15.10.2013 by user ekium. Please be aware that information can be outdated.