You can add different prices for different quantity units in your organization's Pricebook, so each quantity unit is priced at different values.
1. Select the item from the catalog, check all the quantity units that apply to the item to allow for varying prices.
2. From the nav menu, select Pricebooks under Offerings.
3. Select the Pricebook that correlated with the Catalog containing the product.
4. Select Products from the middle menu.
5. Click the price field for the quantity unit next to the product.
6. Enter the price in the field
7. Use the date selector to edit the effective date of the price. You can use this feature to backdate or future date this quantity unit's price for the product.
8. Click the green save icon to enact the pricing.
9. Repeat these steps for all the quantity units of this product.