$hierarchy
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Note:The model builder will now allow the animator to change the bone hierarchy between animations, at least in the source. The hierarchy is unified into a single fixed hierarchy for playback, but it's often easier to change this for certain hand animation tasks. The hierarchy is defined by the first instance of the parent->child relationship.
$hierarchy is a QC command available in all 
Source games. It forces a specific bone hierarchy on the model, regardless of what's in the reference file. Normally, the bone hierarchy is generated based on the first occurrence of a parent child relationship. This commands allows you override it with any arbitrary hierarchy.
Note:The model builder will now allow the animator to change the bone hierarchy between animations, at least in the source. The hierarchy is unified into a single fixed hierarchy for playback, but it's often easier to change this for certain hand animation tasks. The hierarchy is defined by the first instance of the parent->child relationship.Syntax
$hierarchy (child bone) (parent bone)