Roll a ball, how to addforce to the ball in an isometric environment ?

Hello, I struggle to set up my character controller script that move a ball by applying forces to the rigidbody in an ISOMETRIC environment. I found many tutorials about how to move a character in an isometric environment but it's by using transform.position and i want to use the same controls as the tutorial "roll a ball" but in an isometric environment. I am still beginner with c# and Unity so if someone has the solution... :)