"Goodness me what a detailed reply :o) thank you so much it seems that the problems that put me off upgrading before have now been fixed.
Silly question, I have four separate trees if I link one will it link them all?
Many thanks for all your help."
No, you can only have one tree linked to one FTM file
So if you have four separate trees (files) then you need to create an online AMT for each of them