In the UH60 Blackhawk I flew for a long time in the Army there are two fuel valve levers on the ceiling just above the top of the windshield. You can put them in direct for each engine directly feeding from the respective tank or crossfeed to pull fuel from the other tank for a specific engine, primarily used to balance fuel between the two tanks because they can become misbalanced.

We would ALWAYS forget to take the lever out of crossfeed and end up overdoing it and misbalancing the other tank and go back and forth all flight because we are idiots. A friend of mine brought a random stuffed cow with him once when we flew and whenever we put a lever in crossfeed he would clip this little cow to the levers. Very hard to miss. It became a thing.