Shell problem - opening in a cylinder

[ziegler123]

Hello.

I'm fairly new to ROBOT SA and I would like to model a structure that's really similar to the attached image, only that I would like to model it as a shell and not as a solid! But the only problem that i've encountered so far is creating the opening in the shell model. I've tried to do an object combination but i honestly can't get it working with shells!

I've tried to do with solids but the model gets a llittle heavy, so therefore i would like to avoid that.

Any ideas? 

Thank you!

@ziegler123 Artur Kosakowski edited the topic for better findability 

[nicklas.holmgard]

Hello! Is this function gone in 2019? I only see Operand A and B, I have no possibility of changing the face-settings down in the shown picture.