I have a 2 story cape with hot water baseboard heat. I just ran baseboards in the basement. I originally tied into the existing system without adding a zone and it basically stole the heat from the rest of the house (taking the path of least resistance).
1. is there a way to tie into the existing system without creating a new zone?
2. My controller (Honeywell R8182) says it is capaple of zones. How do I set that up. What would the plumbing configuration look like and what extra equipment do I need?

If you want to keep it all the same (one zone cheap) then just add a balance valve to the shorter loop and add some resistance forcing flow through the longer loop.