Can the tenant pay a partial rent amount?

You can select if it is allowed or not. In each lease you can check-mark "Allow partial payments" if you want to allow partial rent payments. If you allow partial payments, then a tenant can schedule a payment that is less than the total amount due. If you have roommates, this also allows roommates to each schedule a payment separately. If you don't allow partial payments, then one person has to schedule a payment for the total amount due.