Linking Accounts Question

I have an account with nightfall and prophecies and I have an account with factions and prophecies.

My question is if I buy guild wars trilogy will I be able to link factions to the first account and nightfall to the second account and then just have a proph only account? Or does the trilogy come as 3 accounts that cannot be seperated.

I would not be buying from the online store if that matters.

The trilogy pack only has one key that unlocks all three campaigns for one account. So no, you won't be able to do what you asked.

It's not possible to link two separate accounts, not matter what combination of games you have on them.