If you are trying to print them on the same page, that is not currently a function of the Database. You can print those cards that you Have and those on your Wantlist, but not both on the same sheet directly from TCDB.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.