If you put the cursor in the IRC box on the asset entry worksheet and hit the yellow ? on the toolbar, it will give you a list of amortization codes.

You also need to scroll down the asset entry worksheet near the bottom and enter the length of the loan for it to compute.

Thank you so much Lisa, the "?" did not work but the "right-mouse-click", "About IRC code section" worked. 

Thank is what I used. Thank you.