Single Customer Invoice from Multiple Sales Order

Single Customer Invoice from Multiple Sales Order

Hello

I know I have seen this topic on here before but couldn't find it!

I invoice my Customers monthly from Sales Orders (Subscriptions Module doesn't work for me as you can't create a Subscription from a Sales Order).

I now have a Customer who has taken on additional SaaS Licences so I created an Estimate which they accepted and I converted into a Sales Order which I will invoice each month, is there anyway I can create one invoice a month from several Sales Orders?

Thanks in advance