Can I set up new invoice number every month for recurring transaction?

Hi Suzanne13, 

I can see how useful it is to set up custom invoice numbers on a recurring transaction. At this time, there isn't a way to customize the number on the recurring invoice. You'll have to manually change the number once the recurring transaction is created.

To help us make the product more convenient for your business, I encourage sending feedback directly to our product engineers.

Here's how:

1.     Select the Gear icon, at the top then Feedback.
2.     Enter your comments or product suggestions then select Next.
3.     You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4.     From the drop-down, choose the appropriate Category then select Send message. 

Let me know me if you have questions. I'll be on standby.