Once the grant and gift have been posted, they can not be changed to an Interfund.  If the application and gift have been entered, but not posted, they can be linked via the Interfund Link tool. (See How do I create an Interfund by linking a gift and a grant?).

If the grant and gift have been posted, it will be necessary to cancel the grant and reverse the gift, then create an Interfund transaction (See How do I create an interfund gift and grant?).