Answer 5:
You usually don't need a separate actor (group) for the brake calipers, since the calipers won't move in the car figure. Therefore, the calipers are part of the carbody, and the wheels are a separate actor.
If your car object has separate caliper groups, include the caliper geometries into the carbody group, and delete the caliper groups:
1. Open Group Editor.
2. Select the carbody group in the Group Editor.
3. Click "Include Group" and select a caliper group.
4. Repeat for all caliper groups.
5. Select a caliper group in the Group Editor. Click "Delete Group". Repeat for all caliper groups.
Caution: Don't delete the wrong group by mistake. And don't forget to delete the caliper groups, otherwise you have two groups including the same geometry. Before you spawn the props, check "Show Multigrouped Faces" in the Group Editor. Poser highlights all faces which are members of more than one group. When you spawn props from an object with multigrouped faces, you get a duplicate of the same geometry. For example, the caliper geometry is included in the carbody part and in the caliper part.
If your car has a moveable suspension, you group the caliper geometry with the part where the caliper is attached. Of course, the geometry of the suspension should be mechanically consistent. This means, there must be some geometry where the caliper is attached (usually the housing of the bearing).
When you have different parts which should roll with the wheel, you choose a common parent for all rotating parts. For example, you have an actor "axleFL". When you rotate the wheel, you set exactly one rotate channel of actor "axleFL". All actors which should follow the rotation are children of actor "axleFL". The hierarchy could look like this:
2 axleFL
3 brakerotorFL
3 rimFL
4 spinnerFL
4 tireFL
Now when you rotate "axleFL" all children follow the rotation, that is the brake rotor and the
rim and the children of the rim.
Usually you don't need a separate tire actor, unless you want to move the tire away from the rim in your car figure. Therefore, you group the rim and the tire and make a single actor "wheel".