I've gotten a lot of crossbreds in my herd now. I milked until four years ago and they were mainly Holsteins, but I did have some half Jerseys and half Angus now and then.
Holsteins crossed with Angus generally look like black Holsteins with a lot of black on the udder and black all the way down the legs. They milk pretty well. Next generation bred to Angus, then they turn out still a bit rangy, but beefier, and you will get some that go to the Holstein look, and some that go to the Angus look. Keep going to Angus and they look like Angus.
The Jersey crosses with Angus are the same, but they are a smaller animal, finer boned, and they need at least another generation to get something that you would be happy to put in the freezer. I have a half (Red) Angus, 3/8 Jersey, 1/8 Holstein bull right now that I want to get rid of that I might as well put in the freezer as ground meat because he's not going to market for much of anything. His half brother, a cryptorchid bull from a half Angus, half Holstein cow, is a walking pile of meat.
I also have some Milking Shorthorn x Holstein cows and they look like oddly marked Holsteins. That bull was from a milking line. The one beef type Shorthorn I have (she has a picture somewhere in this forum, she's the one who doesn't milk) is a very big beefy looking cow. She calved a while ago to an Angus, and I'm growing out her bull this year to use for a year for breeding.
With the span of time required to grow out cows to breeding age, and the numbers you have to have to cull from, it's a lifetime's work from someone with a big herd to actually create a breed. The old breeds we have today were mainly created by groups of farmers in isolated areas that in effect had a large herd to draw bulls from. That's not to discourage someone from doing it if they want to do it, but you have to look at it with practical eyes. I do it for the fun of it, but I'm perfectly aware that any cow man looking at my place would roll his eyes.
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