Hi Pixonti. I know it's important to be given the most accurate instructions to achieve your goal. The steps shared with you were referenced from this official support article for QuickBooks Self-Employed: Exclude or delete transactions.

I want to make sure you get the help you need so you can delete your transactions. I'd suggest reaching out to the designated Self-Employed team so that our experts can get you back on track. 

Have a great day.