I see you’ve posted the same question in the Community space. I’ve already responded to your previous post.
If you haven’t read it yet, you can check it out in this link: https://quickbooks.intuit.com/learn-support/global/manage-customers-and-income/discount-and-round-of...
As always, in case you need to learn some tips on managing your QuickBooks Online (QBO) account, visit our Help articles page for reference.
I’ll be around if you have other queries. Take care!