The list shows items from the last month by default, but you can adjust the Sales Date Range. Customise your results using the drop-down menus just to the right of the date picker.

You can tick the Order checkbox to add items to your Reorder List, and they will automatically add 1 to the Qty column. You can over-type this with your own quantity if needed. 

When you have finished your work, press Add to Order List, or if you wish to discard your changes / were just browsing, click Cancel.