To be honest, it's difficult to understand your task. It would help if you could attach a picture or a demo project.
You can run a value tween with "In Sinusoidal" ease and Ping-pong=yes settings. And add the value of this tween to the object's motion (speed or orbit angle).
https://www.dropbox.com/scl/fi/unabdyo98ot8jac68hs5d/Orbit-Tween.c3p?rlkey=lpgsytl2icvrtcah9a3umnb8p&st=u0j47zgt&dl=0
The example above has been extremely helpful.
However, I think what I'm trying to say is that the orbit behavior seems to override all other behaviors in terms of movement. I was hoping for the orbit to influence the overall movement of the object but not override the overall movement.