Works perfectly, I can set the tables as I want. There's further complications though; I need to check (one at a time) each TurbineSite to see if there's a 'local' wtg attached. If not I'll need to attach 'locally' the wtg from the level above and at the same time keep the original for all the other sites in that group. Then do some calculations and then delete the 'local' copy before moving on to the next TurbineSite. Any chance of that happening? I hope it's clear what I'm trying to do. If not let me know :-) Thanks HP