How to Labour charge added in Purchase Invoice

ERPNext Buying
1

I generate the previous year paid purchase invoice but, i have a problem…
How to Labour Charges Added in Purchase Invoice.

For Example:

  • I generate a Purchase Invoice for “xyz” company for “abc” item. But, how to Added labour charge(200 ruppes). and, another thing is GST tax apply on (Total Amount + Labour charge). this is my question.

So, How is Possible. Please Give a Suggestion.