For example some suppliers are C.O.D., some are end of month, net 30, 15th of month following, 20th of month following and some offer discount if paid by a certain date or within 10 days.
Have a payable list or something that would trigger you to take advantage of cash or term discounts or extended terms.
Also, some suppliers offer extended terms on purchases through out the year, example would be CNH's Productivity Plus Account where certain times in a year they will offer 90 days interest free on all filters, combine parts or tillage parts.
Somewhere when entering the invoice you can add the payment term that is different for an individual invoice vs the normal account term. An example from above would be CNH's normal terms are the 7th of each month for anything bought up to the 10th of previous month but a few times a year they offer a sale on a line of items & offer extended terms on those items only.