Need script to delete prior records in file prior to VI import

I have set up a VI import to import Item/Customer Pricing info for a single customer into IM_PriceCode.  However, I would like to run a program as part of the VI job "On Execution" that would remove the previous records for that customer so my imported records will be the only records on file for that customer.  If an item has been deleted or that customer no longer buys that item, I don't want those old records still in IM_PriceCode after my import.  Any thoughts would be greatly appreciated!  Thanks!