You can use the Export Grooming and Import Grooming options to save a groomable splines Description and its associate Ptex maps. You can then load the groom onto a mesh in other scenes or the same scene.
To save or load default and archive primitive Descriptions, see Export and import Collections and Descriptions.
Although the Description's primitive spline data is included in the exported files, the values used by the groomable splines do not get preserved when you export the groom. You need to reset them after importing the groom.
If you created an Alembic cache of the source mesh, import the cache and select the mesh.
Otherwise, as all of the imported settings will reset to default values when you input the Density value for the groomable splines. This means, you will need to re-import the groom.
The path to this directory should be similar to the following:
C:\Users\<username>\Documents\maya\projects\default\xgen\collections\collection2\description2\groom.
For more information about XGen files and directories, see Ptex map file locations in XGen.