Welcome back to the QuickBooks Community! I hope you've been well since we last heard from you, and I'm excited to see that you're still using QuickBooks Online and QuickBooks Online Payroll. I'd be happy to point you in the right direction on this.
It sounds like you may be talking about entering an advance for an employee before a pay run later on. If that's the case, we have a great article that can walk you through this process step-by-step with recording it in payroll. Check it out here: How to give an employee cash advance pay on their pay cheque. Following those steps should get you on track with to recording the amount given to your employee outside of the pay run.
If that's not the kind of advance you're referring to, feel free to elaborate further in a reply. In the meantime, I'll also leave you with this page where you can see a collection of helpful articles about using Payroll in QuickBooks Online: QuickBooks Online Payroll help article hub
I hope this has been helpful! I'll be around if you need anything else.
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