Are you asking to be walked though how to create an inquiry in GridView that lists all items that have been purchased by a customer?

One of the sample inquiries installed by GridView is called 'SalesInquiryJoin' which shows Sales Analysis transactions and a way to 'join' a customer list and an item list to determine sales for a spcific customer and a specific item. This is a little more advanced.

To get a simpler view that just shows customer sales, you could look at other sample workspaces such as CustomersAndTransactions.gvs or CustomerOrders.gvs to see how to link one view to another.

To get more information on how to link view or use the join feature, check out the recorded webinars for Adagio GridView.