is there is any relation Between the Discount in Purchase Line and Sales Line In AX

Actually i am Adding Two Discounts in the PurchorderTable form in the Line level we are adding the Multiple line in the purchase order form.

i am adding four fields in the PO Line level, i am adding these four lines in the Purchline Table.

i am customizing lot classes in Standard AX,

i want to know is there need to add these same fields in the Sales table.