To All

How do I "update or replace a table" in the data base with new information without loosing my connection to forms that I have created? ( I am hesitating to use use "append table" because I have added information and new field on the new table. )  What I have done so far, is rename the old table, and name the new table with the old name; to do this I had to delete the relationship and connect the relationship of old form to new table.  But what I have found was that although the control source property is the same and the form shows up in design view, but I can no longer view any data information in form view.  What is your suggestion?

P.S. I have a back up of the data base.