You can create a Transform constraint to hold specific nHair curves CVs in place or move them through XYZ space.
To create an nHair Transform constraint
The nHair curve CVs you selected are now constrained to their current positions in X, Y, and Z space, and a Transform constraint locator is created for the selected nHair curve components.
The curves are also now connected to the nHair system's Nucleus solver through a dynamicConstraint node.
The preset properties on the dynamicConstraint node determine the constraint’s type (in this case, a Transform constraint) and how it behaves. For example, you can create a Transform constraint with the following attribute settings:
Within Max Distance works well with nHair Transform constraints.