However, you can make multiple hair constraints that are assigned to multiple hair systems act like a single constraint by parenting your constraints to a single constraint, and then hiding the child constraints.
The Assign Hair Constraint Options window appears. See Hair > Assign Hair Constraint.
If you clicked Assign Constraint or Apply, the selected follicles are added to the selected hair constraint or the hair constraint is reassigned to the selected hair follicles.
Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License