Top Law Schools

If I already submitted NeedAccess to three schools but want to add a fourth one, should I "remove" from the list the three schools that I already submitted to?

It seems like if I just simply added the fourth one and hit the submit button, I would re-send to the other three schools as well (which can't happen, because I'll be including the merit-based aid I'm getting specifically for the fourth school)

I think each school will pull your information from NeedAccess after you have been admit and you have applied for aid.
So you need to list all schools you are interested in all the time.