Thank you for your reply. Yes you have the right picture of cable.
The thing I think it is important to get into account the flexibility of cable.
Take 1 m of 1 cm^2 section Steel rod - Bend it,
and take 1 m of 1 cm^2 cable - Bend it. I am betting you, that you will get much better bend results in the cable than in a rod.
In my situation, I have tower which is supported by 3 cables, 2 cables will be in tension and 1 will be in compression (Forces shift of course, but the Cable - rod under compression would not get the results I search for, and make construction much more rigid that it is in life).
Do you understand now, that the flexibility in these configuration differs a lot, that is why you will get different results in calculations. And approximations in this case is really big. Unless there is a way to define higher elasticity to the material itself, and make it's property to act as a cable? In this case, that might just work.
Maybe there is a way to do that?
Assign a Steel Wire - Cable Elasticity to certain rod extrusion for Stress analysis to treat them as cable?