How do I send an Invoice for Mulitle Items a buyer wins?

This is not a hard process, but may not be obvious. Here is the quick tutorial on how to do this.

First Login, and go to your "My Account" Page. Click on the "Selling" Tab, then the "Sold" sub tab:

Next, locate an item that the particular buyer purchased from you, then click the link that says "Send Product(s) Invoice":

On The next screen, you will see ALL of the items that the buyer has won. Select the items you wish to send the invoice for, most of the time you should select them all.

Make sure you fill in the shipping cost, discounted for multiple items if applicable, and insurance. You can split it evenly among all items or just charge it for one item and put $0 for the others.

Finally, Click Proceed and you will see the following screen:

That's it! Simple enough!