The best approach you have available is to add another grid to the sales by period backend page due to the fact that the control used there is highly non-extensible. In order to add the additional grid, please go to Administration->Backend Pages and locate the Reports page.
Next you will need to create the control. I can advise you use a RadGrid
bound to your orders. For further information on how to query orders, please consult our Documentation
. Make sure you apply advanced data binding
to the grid in order to use all of its filtering functionality.
Ivan D. Dimitrov
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