One-Off Suppliers
You do not need to create a separate supplier record for every organization you deal
with.
For example, you may make a single purchase from an organization you are unlikely to deal with again.
Instead, you can define a single one-off supplier and enter all of the invoices from one-off suppliers to this single record. You use the Single Payment payment method to indicate that each transaction (invoice) will be paid for separately, and reference the supplier's address on the transaction.