Update BPA Item Category for items that have had Item Category changes

We created several BPA lines for inventory items that only had the default "Undefined" purchasing category.  Now that we have had time to create the appropriate category, we want the BPA to reflect the updated category.  Is there a concurrent application that will update the category in the BPA?  We are trying to avoid creating new BPA and/or BPA lines.  This if for inventory items only, not purchasing we do through iProcurement.

Stacy W