To add a margin-
Select a catalog
Click on the product you want to sell
Select ADD TO CART
Choose size and quantity, and then click on DONE
Go to Cart
Choose a payment method
Enter your customer’s pin code to include the shipping charges, and then click on CHECK
Now you will see the total price, which is product charges plus shipping charges
Click on Proceed
Select the customer’s address or add a new one
Click on Proceed
Select the existing details or add a new one
Click on Proceed, again
Here you have to enter the final amount that you want your customer to pay this final amount is the product charges + shipping charges + your margin Your margin will reflect here.
If your customer has confirmed the order, click on Place Order.