Jumping forward in Clips and getting playing clip id

Hi.
I want to jump forward in a track that is playing (by 1 bar, by two bars etc.). Is there a way to do this and have it be quantized? So that if I have two tracks playing, and one is 2 bars behind, I can jump it by 8 beats (and still be quantized?)
Also, how do I access the currently playing clip ID of a clip on a track. I know there are commands like "selected scene" but I don't know the shortcut for playing track....

Here is what I have: I use the playing slot index command to get the playing clip, a deferlow to send that information to the path, then try to do "call move_playing_pos 4" for 4 beats....