Not into the terms in a literal sense, but you could put this information into a custom field for that vendor in the maintain vendor window. If you have Quantum, you could also use the track it panel (Order Process Workflow) to assign a a special status to purchases for this vendor so that they stand out. The Track It panel also allows for notes.

Another option is to set an alert so that every time an invoice is created for this vendor, some one gets an email reminding them to pay using the terms you mentioned.

If you don't have Quantum and are interested in an upgrade, we can help you with that. Send me an email or give me a call.

Thank you for the help.