Can Sap2000 model these? 2

I think it supposedly can do most of that. I don't think it has initial shape cable net form finding, though.

To be honest, I've tried to use these features in Version 10 and gave up. It just didn't seem to be working right.

It's probably one of these CSi semi-bugs, like you have to hold down Ctrl-Alt-Shift-Delete, while doing 3 counterintuitive steps to get it to work.

The cable element and cable options improved a lot between version 10 and version 11. Go to the CSI website and check out the cable tutorial to get a handle on finding the cable shapes. As for pretension, you can model it as a strain load, or instead of modeling it as a cable, model it as a tendon.