Using the variable section sweep is something that takes practice. This is definitely an advanced function.
This also requires significant computing power. Technique is important for the models to remain interactive.
You really want to be conscious about your geometry. Do your homework on the actual geometry before you begin making the part. You have to know how to use curves and joint them to make the sweeps if you are after the diagram in your original post.
I also recommend using an assembly to add the elements together.
Normally, details to this degree are ignored in CAD such as Creo. We make a tube and give it a cable texture and all is good. But all to often a marketing type will think it nice to have a real "thing" made in CAD when they have no idea just what they are asking.
Many of the participants in the forum know how to get these results, but it is not simple lesson. It is at least 4 levels comprehension of the software and defining cable in general.
