Easily Add Existing Product(s) to Customer's Account
Currently WHMCS has a very non-intuitive way to add existing product(s) data to their account.
For example, let's say a customer already has a domain with you and it was purchased outside of WHMCS. Now you want to add that product to WHMCS to bill and track the product. There is no intuitive way to do this. The only way is to add a new order, uncheck the 3 options that send related emails about the new order to the customer and to set the product to active. When adding the domain, your only options are, none, register or transfer.
In my opinion there should be another way to add a new product besides 'add new order' and just silence all the emails from going out.