[A] It may happen that delivery date, discount and comment column do not show while creating Sales Quotation (SQ).
[B] In order to add these columns in SQ. Check in the Items section, scroll to the right side, click on the downward arrow.
[C} There is a drop-down list. Click on the "Delivery Date", "Comments" and "Discount" to select them.
[D} All three columns will now be visible.
Keyword: Delivery Date, Discount and Comments