Hi.

First of all I have to say thank you and sorry for my delay. I had no chance today to answer erlier. But now, I'm back ;) 

What I'm looking for is to find the right Tool to cut polygons starting from one Vertex or Edge to another (opposite) one.

I know this from other tools and there it is often called "knife" or "saw" or something similar.

Attached there is another picture of what I mean or looking for.

I  want to cut the selected polygons in that way, that I click first the Vertex 1 and than the opposite Vertex 2. The result should be a new edge straight to all the polygons (under the green line).

Just to have something to cut polygons in different pieces.
I hope the picture will explain it good enough.

Thank you in advance.
wal