The Pledge Entry form has columns for the Year, the Family, and Pledge and Building Fund Pledge, as well as Pledge Paid in Prior Year and Building Fund Paid in Prior Years. You can create a new record by clicking on the "New Record" button. You then enter the year, select the family name, and enter the amounts called for in the amount columns.
These numbers will be posted in the Giver Summary table. However, if you should re-run any calculations in a prior year that would affect either the "Prepaid Last Year" or "Building Fund Paid Prior Years" fields, they would be updated at that time.