I think I know what you mean, like a transition between tile and hardwood? If so I made some of these a couple years ago with a jig on a planer.
For the jig I cut a short board that was 1-1/2" thick, 4" wide and about 3' long. I put the blade on the table saw at full height and about 10 degrees off straight up and down and ran the board through cutting most of the way through it. Then I laid the flat side down, lowered the blade and took a wedge out of it with that cut. I waxed the 3' piece, clamped it into the planer, and ran the tranistion pieces over the top of it at an angle and used the planer to cut the angle on the transition, turned it around and cut the other side of the transition.
The transition piece I was cutting were only about 1/4" thick, so I didn't feel like it was safe to cut on a table saw. I tried cutting a 3/4" board on all 4 corners then resawing, but the surface had some burns in it, and generally the wood not being perfectly flat over the 9' lengths make a inconsistant cut. With the planer, you can feed 1/4" strip in that's not perfectly flat and it does just fine with a very consistant cut. I'm not sure that's all clear, I struggle to describe things without pictures.. If anyone wants a picture, just msg me and I'll try and post one when I get home.
You can do it on a table saw, especially if it's a thicker piece, but this method worked well for a thin/not perfectly flat piece of wood.