I run the books for a non for profit, I set up 2 A R accounts, 1 for the general account an one for the Budling fund.

how could i link that every item or income account should go to its right AR account?

for example i have a item called "Membership" (set as a service) that is linked to the membership income account how do i set that this should always go to the GA AR and a pledge towards the budling fund should always go to the Budling fund AR?