How do I send a current invoice to one of my projects with out creating a duplicate invoice?

You can easily send an invoice, Riemerm11. This will not create any duplicates.

I'll help you how:

1. Open the invoice.
2. Click Save and send.
3. Select Send and close. 

Let me share the article on how to email or print an invoice as an additional reference. 

You're always welcome to visit the Community. We'd be pleased to work with you again.