Can a deluge script run on user input in a form?

I have an application which creates a form Temp_Inv that is used to input monthly inventory & orders. at the end of the month, the following fields are exported to a form Month Summary be added to the Inventory form:
      Item ID
      Yesr Month
      Inventory Amount
      Order Amount
All records in the Temp_Inv form are then deleted and new records are exported from the Products form.

I want the Temp_Inv form to have fields Last Inventory and On Order which would be the values in Month Summary form for each item, but it only needs to run once.

Could there be a button on Temp_Inv or Month Summary labled "Update for Last Month" which would run the deluge script to do the update?

Thenks
Alex Scott