Invoice Specific Items from an Order

Hi,

I am using CRM 2013 and we are trying to automate the sales process on CRM.

When we create an order we want to be able to create a partial invoice for specific items in that order, due to our very long sales cycle.

For example there are 2 pallets of soda on the order, and we want to be able to invoice for only 1.

If you create an invoice it will create the invoice for all the products, and you cannot edit which ones you want to invoice for. If you edit the products on the invoice it will edit the products on the order as well.

Any help would be appreciated!