Hello,
You want to import the animated curves into an existing groom?
The ourkflow we established is:
Create a new hair object on your character,
Collapse the whole modifier stack, a BakedHair modifier will be created,
In BakedHair you can load an alembic file with animated curves from any software.
Now that you have animated curves, you can use them to generate hair, or even copy the whole hair stack from your finished groom to the animated curves.
If you are exporting the full groom from Houdini and you don't need hair interpolation then you don't need to generate hair, BakedHair modifier will generate it for you.
Jeordanis Figuereo (Product Designer. EPHERE Inc.)