How do I combine Orbiting with mouse drag and with a button click?

Good day all!

I have like a model viewer setup and would like to know, how do I go about combining both mouse drag and click on a button to orbit/rotate the model?

This is what I have in my Update:

 if (Input.GetMouseButton(0))
         {
             if(isZoomedOut)
             {
                 x += Input.GetAxis("Mouse Y") * xSpeed * 0.02f;
 
                 x = ClampAngle(x, xMinLimit, xMaxLimit);
 
                 Quaternion rotationX = Quaternion.Euler(x, 0f, 0f);
 
                 thisObjX.localRotation = Quaternion.Slerp(thisObjX.localRotation, rotationX, dampSpeed * Time.deltaTime);
             }
             else
             {
                 xZoom += Input.GetAxis("Mouse Y") * xSpeed * 0.02f;
 
                 xZoom = ClampAngle(xZoom, xMinLimit, xMaxLimit);
 
                 Quaternion rotationX = Quaternion.Euler(xZoom, 0f, 0f);
 
                 zoomObjX.localRotation = Quaternion.Slerp(zoomObjX.localRotation, rotationX, dampSpeed * Time.deltaTime);
             }
         }
 
         if (Input.GetMouseButton(0))
         {
             if(isZoomedOut)
             {
                 y += -Input.GetAxis("Mouse X") * ySpeed * 0.02f;
 
                 y = ClampAngle(y, yMinLimit, yMaxLimit);
 
                 Quaternion rotationY = Quaternion.Euler(0f, y, 0f);
 
                 thisObjY.localRotation = Quaternion.Slerp(thisObjY.localRotation, rotationY, dampSpeed * Time.deltaTime);
             }
             else
             {
                 yZoom += -Input.GetAxis("Mouse X") * ySpeed * 0.02f;
 
                 yZoom = ClampAngle(yZoom, yMinLimit, yMaxLimit);
 
                 Quaternion rotationY = Quaternion.Euler(0f, yZoom, 0f);
 
                 zoomObjY.localRotation = Quaternion.Slerp(zoomObjY.localRotation, rotationY, dampSpeed * Time.deltaTime);
             }
         }

My orbit (left/right/up/down) buttons set a bool witch triggers the orbit in the Update like:

 if (isOrbitUp)
         {
             thisObjX.localRotation = thisObjX.localRotation;
 
             thisObjX.Rotate(Time.deltaTime * 20f, 0f, 0f, Space.World);
         }

This is what my hierarchy looks like:

How do I make these 2 methods work together?