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 price list:
In a Commerce Assets project, navigate to Price Lists and show Price Lists.
In the Navigation pane, click the check box next to the price list that you want to delete.
Click Delete.
Click OK in the confirmation dialog to delete the price list or click Cancel to leave the price list unchanged.