Just go to my eBay, sold folder. Go over to the RHS of page and click on send invoice,(or click on the more option drop down menu) it will usually combine both purchases or ask you to. It will open a new page adjust the postage if you need to buy deleting postage cost already there, do not hit the recalculate button. Instead go to bottom of page and hit the preview link next to the send button check it then send invoice.
