Good day, @asdanonymous.
I recognize you need to record write-off bad debt without ruining the Profit and Loss report in QuickBooks Online.
Uncollectible income can come as bad debt in bookkeeping. To keep your accounts receivable and net income up to date, tracking them in your book and profit and loss report is essential.
However, the steps to track them in your QuickBooks account are by following this article: Write off bad debt in QuickBooks Online. In this article, let's create a bad debt expense account that will track them easily.
I also recommend contacting your accounting professionals to guide you further with recording write-off bad debt in another method. Find an accountant at this link: https://quickbooks.intuit.com/find-an-accountant/.
Please keep in touch if there's anything else I can do to help you succeed with QuickBooks. I've got your back.
