Cut off area on profiled beam

There is more than one way, to cut the beam.
You can do it in Dicam with:

3-1-1 and create a <New> process, defined by own measures.
3-8-1 after creating a secondary beam
3-8-4 also with a secondary beam
2-7-1 with a secondary beab, in case, you only need a plan, but not a machinery process

Did you already try one of these solutions?

I cannot find the function to get the screen, that you show?
It looks like wall design...
and then?

When I open wall design, there is no offset menu.
I only see the wall and the beams.

hmm... in my software version (beta 15.10) I can use this function in wall design without any problem.

I think, you are using [mm] units?
If you are using [m], the value of 145,000 will make an offset line far outside the wall limits.

no other idea...