Right, what he said :-) See, the dials in "Body" don't actually change any geometry themselves. They're FBMs, like the one you're trying to create -- that is, they combine OTHER dials, which DO change geometry. That's why they can't be combined into an FBM. However, if you want to get really technical, you can set up Enhanced Remote Control (ERC), which essentially means making one dial directly control another, in what's called a "Master-Slave" relationship. With ERC, you CAN combine FBM dials, as well as any other type of dials. But setting it up takes some know-how (or a good utility such as CR2Editor). If you want to get more info, you should contact Ajax, a master of ERC and the creator of its ultimate application, EasyPose.