AP Vendor backup withholding setup

SOLVED

We have a vendor that we sent a B Notice to because the tax ID/name reported on their 1099 did not match the government's records.  They did not reply, so I need to set the vendor up so backup withholding will be held if we should use them in the future.  Does anyone know how to do this?  I found a knowledge base article on setting up a Mis Deduction 2 field,   Before I tried this method, I thought I'd reach out to for confirmation or other suggestions.