ODBC - how to remove an order that is already imported?

Scenario: I import 10 orders from sql via odbc.  I ship a couple.  An hour later, I do another download.  If, since the last download, an order was canceled or otherwise shouldn't be shipped, it doesn't come back in this download.  In that case, i'd like it removed from shipworks, but that doesn't happen.

How can i have shipworks remove an imported order that doesn't come back in subsequent downloads?  thx!