behavior tree no navemesh

I am trying to use a behavior tree however I dont have a navmesh for the movement, is there any function that will let me use the behavior tree without having a navmesh?

I am trying to make something that can walk on walls and the floor etc so I know I will have to manually program all of that I was just trying to see if there was any easier way then completely recreating all the movement logic, something that can “walk” in a specific direction would be perfect.