If you are looking for a script that is already pre-made, then you will not find something like that. These forums are not set up that way.
Have you tried searching the forums for anything similar?
What have you tried, if anything?
My first guess is that you will need to isolate each beams bounding box and then have Dynamo use that info for a reference plane placed at whatever degree you want. What will be difficult (maybe) is the Corner Cut command under the Steel Connections. I have not seen many (any?) scripts that go that far into the Steel Ribbon, especially with connections. Not saying it can’t be done . . . .
Try and post something, and hopefully others can than help you along the way.