Welcome aboard RazorBassin. Always nice to see new stock here at the Do-It boards!
As Gary mentioned, the plate splits a bait color as long as the mold is formatted to do a top and bottom. Some molds make two sides and the plate is a non-worker there.
Using the plate on your Wutzits you can split the top and bottom, then inject the top side using a twin injector to get a dandy three color bait. The plate comes in handy if you are going to be making a pile of baits but for a few here and a few there, like I do, I just hand pour what I need and finish with the injector. IF you opt for the plate to get your itch scratched, I very heartily suggest heating up some scrap plastic and practice doing the hand pours anyway. This is a cool way to work up baits....try short pouring the top AND the bottom halves using different colors and then injection the third color for the core and tail. Cool stuff if you want to take the time to play and learn, but if you're doing repetitive shots of the same couple colors the plate is your way to go.
Again....welcome to the Do-It forums.