Yes, you can make the payment in installments or parts. But half of the amount has to be paid in advance otherwise the work will not get started as the writers would need the money. The customer has to clear the balance to receive the order once the assignment is completed.
However, we have exceptions regarding bulk orders that are generally exceeding 400 USD. A facility is provided in which the client can make the payment in 4-5 orders. But in that case, too, the amount of work will be done according to the percentage of payment made so far.