setting up a bill to be paid off in X installments

:) Hey everyone! I want to be able to set up a recurring bill to pay off a bill in X installments - for example - I buy a new computer today for $1000 and I want to pay it off in 4 months - my thought was to go in and set up a bill that was recurring every month on a certain day for $250 - and then as in most calendar apps - have an end-date - this example would be 4 months from now - 4 payments of 250 gives me the 1000 - i can't seem to figure out how to have a recurring bill that ends after on a specific date