Portal 2 cables

How I do those cables decorations like in Portal 2?

Also in the Portal 2 hammer editor.

Some pictures of those cables would be much appreciated.

just load up model viewer and browse props_bts, props_cables(?), or props_backstage
most of them are in one of those, i think

write down the model names you want into a notepad app or something then look for the shit in hammer

yes but those are models but there are those things where you can define how long you want it like a rope

Use the dedicated rope entities, move_rope and keyframe_rope.