How to insert a master foot note in many other word documents

Footer I mean.

I manage to make this work by using : insert -- object -- text from file -- insert as a link.

But still I found it really buggy... If I make changes to the orginal separte footer file, and them update it (F9) in the document where I insert it, it often duplicate it, or change its position ... Don't know if anyone have experience with this.

Thanks
CC