We need ZOHO to speed up on implementing the deposit option

We work with a lot of customers that require us to send them an invoice for deposit. At the moment we have to create a new invoice separate from the original which messes up the accounting. We need to have the option to invoice for whatever percentage required of an invoice.

Please see if this can be sped up as it is creating an accounting mess and this should be a standard option with accounting software.

Thanks.