Hi Ankur,
The most simple way to handle your scenario, is to post the security deposit request with clearing restriction 8. When the next invocing run happens, the clearing restrcition will be removed and the due date of the SD is in sync with the due date of the invoice, as per Standard functionality.
Now, if you want the customer, to pay the SD amount in 6 instalments, then raise 6 different SD requests and they all will get captured in the respective invocing run and will be send to the customer.
Thanks,
Amlan