Adding a Markdown option on a service.

It's the same function; Mark Down is negative and Mark Up is positive.

You do these with: Other Charge Items, with Price Levels, with Manual Changes to the Price, and with Credit Memos.

Thanks for posting here in the Community, Yunii.

I'm here to share some insights on how the markdown option works in QuickBooks Desktop.

One way to add a markdown in QuickBooks is to add a Discount item on your sales transaction.

To do so, please follow the steps below:

To add a discount item:

1. Select Lists at the top, then choose Item List.
2. Click the Item drop-down arrow and select New.
3. In the New Item window, click the Type drop-down arrow and then click Discount.
4. Enter an item name, such as Discount.
5. Enter the Description that you want QuickBooks to put on your sales forms when you apply the discount.
6. In the Amount or % field, enter the discount amount or percentage:
7. If the discount is a percentage, enter the number of the discount followed by the % symbol.
8. If your discount amounts vary, you may want to leave the Amount or % field blank and enter the amount directly on your sales forms.
9. Click the Account drop-down arrow and then click the income account you want to use to track discounts you give to customers.
10. When an income account tracks discounts on sales, the account is often called a "contra-income" account.
11. Click the Tax Code drop-down arrow and choose a tax code for this item.
12. Click OK or click Next to create another item (see screenshot below).

To add the discount item on a transaction:

1. Open a sales transaction.
2. Under the item section, insert the discount item immediately after the item that you want to discount.
3. Enter the needed details and click Save and close.

To learn more about adding a discount item, visit this article: Add, edit, and delete items.

That should work for you. If you have other questions about QuickBooks, feel free to let me know. I'm always happy to help. Have a good day!