Dotted Lines for Compound Measures

Hello,

I am trying to insert a dotted line in a full score, the time signature is 15/8 (7/8 8/8) and I want to insert a dotted line between the 7/8 and the 8/8. Is there a way I can do that for the whole score with one command, or do I have to manually change each measure by adding the dotted line after the first 7/8? It is working manually but it will take me weeks to do it for the full movement if I do one measure at a time.

Thanks!