You can try the recurring invoices option, Penny10.

This let's you create invoices with the same items automatically on a regular basis. You can follow the steps on how to do it:

1. Click the Gear icon, and then select Recurring Transactions.
2. Click the New button.
3. Select Invoice as the transaction type, and then OK.
4. Enter a Template name.
5. Select either Scheduled, Reminder, or Unscheduled.
6. Select the Interval, and the Start date.
7. Fill out the PRODUCT/SERVICE, QTY, and AMOUNT.
8. Click Save template.

I've added this article for more information with regards to recurring invoices: How to schedule recurring invoices.

Feel free to tag my name if you still need my assistance.