You can delete any price list in the Price Lists tree. Deleting a parent price list does not delete its children, but does clear the children’s Base Price List property. Moving or deleting a child price list does not affect its parents.
To delete a facet:
In a Manage Commerce Assets project, navigate to Search Merchandising and show Facets.
In the Navigation pane, click the check box next to the facet that you want to delete.
Click Delete.
Click OK in the confirmation dialog to delete the facet or click Cancel to leave the facet unchanged.