Keeping a quote live after invoicing (so I can invoice more from it later when due).

We often quote for programmes of work, a bit like a year of services (coaching or events), this is then approved by our client. We then invoice them monthly after delivery.

When I update a quote to an invoice it's my understanding that it then shows as 'invoiced' (sorry new here, just setting this up so can't recall terminology). 

My question is: Can I duplicate my quote or perhaps amend and set my quote back to 'not invoiced' when there is more on it I want to invoice for the next month, and the next etc..?  

If not, is there a better way of keeping track of quoted/sold vs invoiced?