Removing Procurement Controls for a GL BU

I have several inactive GL BU's which I can still use in the distribution line in an AP voucher.  I am trying to remove the Procurement controls we setup when we created these BU's to remove them from selection in the voucher dist line.  How do I remove Procurement Controls setup in the Procurement Control component in Setup Financials / Supply Chain > Business Unit Related > Procurement?  i've tried removing templates but that doesn't remove the BU from AP.