I'm not sure I understand your question. Are you trying to avoid the manual (math) calculation of the coordinate difrerence?
You can use the 'search relative' "SR" command to move to relative coordinates instead of absolute coordinates.
This might be a good application for reuse if you are talking about making multiple 'channels' have identical layouts.
I've used a script in the past to do place components relative to other components (before I had a reuse license).