That's right Dungeoness...If you create a Macro -
/macro SCN "target_custom_next bone"
Then you will have a button on your power bar that will only target objects with Bone in the name, like "Bone Daddy".
Or you could do it as a bind, and have a keyboard button that will do it
/bind G "target_custom_next wolf" and everytime you press G, it will only target objects with Wolf in the name, like a "Nightwolf"
Ohh that is excellent information, thank you.