eBay

I have had a Parcel returned to sender because the adddress was incomplete (i.e doesnt mnatch what is onm the Invoice). I used the Print Postage label system. When I contacted the buyer and Ebay both stated the full address was there but they cannot ...

If I want to sell say 20 items which are all similar (Lets say 20 CDs but by different artists) is there anyway to link them so that buyers when they click on one item see I have another 19 in the same category - or is this done automatically?