Now, you're ready to build your table to track payments. In your spreadsheet, set up columns to organize and calculate each payment's details.The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. Loan amortization schedule. 3. 4, Enter values, Loan summary. Fill in the "Period" column. Fill in the column titled "Period" with your payment dates. Adding extra principal payments in order to pay off the loan earlier than the loan contract calls for. In this tutorial we will add this feature. This Excel spreadsheet makes it easy to view the amortization of a home loan with optional extra monthly payments.