The missing Link....

Hello,

I am using the sub-domain module in OG mode. So far I have created a content type "Cities" for the og groups and a vocabulary "group pages" and terms "term1" "term2" "term3". How do I associate the terms to the og's? ie city1 has terms 1,2 +3, city2 has the same terms etc

If a add a city og, I want the terms to be associated with it and conversely if I add a term I want the city og's updated?

I've been trying to do this for a while now and not getting very far.

Hopefully someone here has done something similar and can help me out...........please!!!

TYIA