You can also graft peppers etc. I've just never done it.
I did not do it last year. Plants were not as strong. Johnnys selected seeds is where I get my root stock seeds look under grafting tomatoes on their site. I think the have a video of how too. I think the site is johnnys seeds actually but searching for either should show up for you. If you google tomato graft lots of places online on how to. It's fun. Plants are really strong. It's done on a commercial basis as well. The machine doing the graft is fun to watch. Obviously I don't have a machine.
All done by hand. I can go into more as to my findings later on techniques and survival tips if you chose to try