To view how much a customer has spent with you, click on the Balance/Aging Tab then click on the Spending Analysis button.

When you click on the spending analysis button a window will pop open showing the amount of money a customer has spent with you.

NOTE:  Each Category displays dollars spent from the previous category.  For Instance,  Amount spent in the Last Month is also included in the Amount spent in the Last 2 months (since last 2 months includes the last month figures also)