Cut througt sheetmetal bend

Hello Users,

I made a section like this and now i want to cut it from the front surface, the higlighted line.

I made a plane under a 45deg angele and did a cut, but now i want the tiny horizontal bit at the oter side of the plane.

i don't want any material at the wrong side of the plane. how can i manage this?

Solidworks does this automaticly and it will look like this:

It would be nice to have this as well in catia