This is the feature from where you can update any Price list Group by Sub-Category with any Item Group i.e. purity.
On clicking the Price List Setting, we get the following-
On clicking on “Add Update Price List By Sub Category”, we get
Select the Price List Group in which you want to update. Next, select the Sub-Category, then Item Group or Purity. The Touch comes automatically. Now all the Items in this Sub Category with the said purity will be added to the Price List Group. Then Update it.
On opening the specific Price-List Group, we can see the Sub Category has been added.