Hello and thank you very much for your replies!
I think I found out how to change the document paths in Kenneth Hobbson's VBA code:
is this right? And can you tell me where to put the paths of all three different word documents and how to add the column A loop?
The problem of macropod's answer is that the 3 letters have completely different text and a different amount of sites. All they have in common is the merge fields...