This sounds like a simple question, but it's really not. First, some kitchen knives with bolsters are not as forged as one might like to think. The bolsters are welded on then polished and shaped with a grinder. Second, there really isn't any difference between a forged and stamped kitchen knife just because of the forging or stamping. That's a marketing thing. Third, many of the high end custom knives are made of steels that are extremely difficult to forge. Any of the SxxV, Elmax, etc. steels are not economical to forge when proper thickness sheets are readily available. Finally, unless you're into investment cast 440C, all steels used for knives are given thorough shaping by hot rolling from the mill.