How do I combine them to make if more efficient for me to use them?
Should have thought about that before you signed up to all three !
The normal way of doing things is you pick one give the others in the alliance your membership details for that one so they can log your points there.
I rather suspect the answer to your problem is you can't, or if you can its going to be a tedious experience involving convincing call-centre operators !
UPDATE:
Look at the Star Alliance FAQ
here, I quote :
Q. Can I transfer miles or points between Star Alliance airline member programmes?
A. No. Once you have earned miles / points in one programme, you are not able to transfer that balance to another programme within the alliance. All programmes remain independent.