Offer details are dependent on the offer type. Below is the explanation of the offer details for each offer type.
1) Volume Discount / Quantity Breaks:
For a volume discount offer type, the details you provide would turn into a quantity break table on the product page.
Each tier will represent a row in the quantity break table. For a volume discount offer type, you will need to provide min quantity, discount, and discount type.
2) Spend Amount - Get Discount:
For a Spend Amount - Get Discount offer type, you will need to provide min spend, discount, and discount type.
3) Buy X for Amount:
Similar to Volume Discount, for Buy X for Amount offer type, you will need to provide min quantity, discount, and discount type. Each tier will represent a row in the quantity break table.