How do I better understand the relationship between microchips and the objects or groups they are attached to?

In this example I am building a helicopter. For simplicity sake, let's say the chopper has two main groups. One is the main body of the vehicle, the chassis. The other is the rotor blade assembly. It's divided up like this because I want the rudder to rotate the chassis, while most of the other controls will tilt the rotor blade assembly. So my issue is this:

If I attach a microchip to the overall object (i.e when everything is grouped together) then I can't get the controller chip to tilt the rotor blades, it will just tilt the whole vehicle. So I tried a few things to sort this out and can't seem to figure it out.

Should I have a separate microchip attached to the rotor assembly group (I have tried this unsuccessfully)? And if so, what happens when a wire my controller chip (which is located on a microchip attached to the whole vehicle) into a microchip that has different scope?

Is it common in situations like this for a contraption to have multiple groups, each with their own microchips?

I think I just need to better understand where I should be attaching chips to in order to get the affect I'm going for.