I'm just going to be lazy and ask rather than give myself a headache trying to work it out. Basically...

Main Acc 1 - lvl 1 char - I want it to 60 without playing it

Main acc 2 - have a level 30ish char, i want it to get 30 free levels

I also want 3 new characters (which I then want to transfer from these basic accounts to 3 different TBC accounts when they hit 60, I gather I can do this without buying the expansion on the new accounts as the destination accounts already have the expansion)

New Acc 3 - Activated by acc 1 (giving main account 1 30 levels)

New Acc 4 - Activated by acc 1 (giving main account 1 30 levels)

New Acc 5 - Activated by Main acc 2 (giving main account 2 30 levels)

OK... this part made sense. The bit I DON'T get is the partying. Since I have no intention of playing Main acc 1 or Main acc 2, can I get the 300% exp bonus in a group with new accounts 3, 4 and 5? Or would accounts 3 & 4 have to be grouped with main account 1 in order to activate the bonus? And Account 5 with Main account 2?

*head explodes