Business can often be faced with billing for a product or service over a period of time as installments.
This could be for a number of reasons, for example customer purchases tickets for an event which is not due for another three months and you could invoice the total amount over three monthly installments either as a fraction or a percentage of the total amount.
This can be achieved by creating a custom entity viz. Installments, where you decide say the amount per installment, invoice due date and some relevant description about the installment e.g. Deposit etc.
The installments can then appear for each Order like so;
We could then write customised invoice generation routine to generate either a standard invoice based on an order ( if there are no installments) or generate several invoices based on the number of installments and their amount and due date (which could become the invoice due date). The only issue is how do you display the related products?
Microsoft CRM offers Write-In Products, what can be possible is to roll up all your product description, quantity and amount into a single description an have the installment amount as the Write-In Product amount. So say you had three installments all due on different dates and possible different amounts. You would then create three invoices, each containing the same Product Description but with quantity set to 1 and the installment amount as the invoice amount and the due date as the installment date, done!