Yes, you can sell multiple items in a listing, but each listing can have just one price.
If you want to create a 'package' of various online properties - websites and/or domain names - you can, but that package will need to have a single price.
You will need to select a "headline" domain which will have it's ownership verified. Other items can be mentioned in the listing description.
Keep in mind that you'll usually receive a lower price for a 'package' than you would if you sold each item individually.