With register by ability business editing line items during check out is simple and easy.

When selecting an item that is in the cart you will be able to adjust the quantity, add a discount, or simply remove the item completely. 

You can also manually change the sales price by selecting “Qty/Price/Discount”. Once you adjust the sales price it will automatically calculate the discount. Then select “Save”. 

If there is a specific discount percentage you can also add it by selecting “Qty/Price/Discount”. Once you set the discount amount select “Save”.

To deselect the line item select “Done”.