If you generate your shipping labels via Sixbit (PRINT POSTAGE/CARRIER LABELS) when you click on MARK AS SHIPPED it sends that information to eBay. If you have several purchases from the same person you need to COMBINE the orders BEFORE printing the shipping labels. After you print the labels and then click on MARK AS SHIPPED it will send the information to eBay.
If you don’t print your labels from Sixbit you can go to the record and EDIT and there is a place to enter the tracking number and type of shipping method. Multiple orders still have to be COMBINED before putting in the shipping and tracking if you want to ship them in one package.