This is blueprint inheritance, that’s what you need to know about
That’s just a random vid, I’ve never seen it explained properly, frankly. So you’ll need to google around a lot.
Basically, you make a tank BP, but only put the parts that will be common to ALL tanks in the parent BP. You could just make the parent tank out of cubes if you want. And all the code to control how the tank moves and fires etc will be in here.
Then you can make children of this BP, which will have proper meshes, and different values for turret angle, ground speed etc. These are made by overriding the parent ( some thing you will learn about ).
You mean like that?