How to model a cable in OptiStruct and apply a pretension to it?

Hi, firstly, I would like to model a steel cable structure with OptiStruct. The cable must work only under stretch/tension. None compression, bending or torsional reactions.

I have already worked with CRODs, but these elements provide all the before mentioned reactions at the same time and I do not know how to apply a pretension load to it or if it is possible for linear static load steps.

Recently, I watched a video tutorial of CGAPs which can be used for the purpose of simulating a cable structure while also applying a pretension load. The problem is that I was not able to set them up properly for my example model (a separated testing environment that I use to test if any of these elements work as I need). For your reference, this is the video that I watched.

I would like to mention that I prefer to be able to use these elements and the pretension in linear static load steps if it is possible.

Thank you beforehand for the help.