You cannot, because ebay has this so screwed up that any day now it will most likely self destruct....ebay has taken micromangement to the enth degree...A little history if you will. BEFORE ebay got into the shipping business and added their wonderful shopping cart( It works like this, a buyer puts items in his cart much like at the grocery store and once finished goes to the checkout get your total and go home...but that is where ebay does not, sure you can get in the check out lane BUT ebay will NOT let the checkout attendant see what is in your cart, nor will they let you ask for a new combined ship total) So ebay forces YOU the buyer to pay shipping on each item in your cart...THIS IS NOT something that the seller has imposed.
Back to the history..."BC" (before cart) a buyer would pick out all the items in a seller store and as long as none were paid for they would show up on the seller hub "sold" listings, the seller hit the "combine items" button and all that buyer had to do was go down thru the list and check the items that can SAFELY be combined(Not everything can be safely packed into one box) and then send the invoice back to the buyer and he paid and I shipped....VERY STRAIGHT FORWARD AND NO CONFUSION ON EITHERS PART...But alas someone thought that it needed "fixed" which has become the mess you now have to deal with, that causes lost sales, bad seller reps, slim chance of a repeat buyer, and most of all one of ebay's Positive ebay experiences LOL.
