There are to ways in handling manual payroll in QuickBooks Online. Let me provide some details on how this works.
If you wish to write a check, you'll need to record the transactions in manually QuickBooks. You have to calculate the taxes manually and then create a payroll account to cover your expenses and liabilities.
On the other hand, recording a payroll manually can also be done using a Journal Entry.
Go to the Plus icon.
Under Other, select Journal Entry.
Choose the date of the paycheck.
Enter the number for the journal entry. You can choose any number for the journal entry, as this is simply for reference purposes and doesn’t affect the actual entry.
Enter the appropriate debit and credits for the account.
While doing this, I'd recommend consulting an accountant on which specific accounts to use in recording the transaction to ensure the best course of action for your business.
Additionally, you may check out a third-party payroll service, that can help you record your payroll transactions. You can visit the apps.intuit.com, or click on Apps in QBO to look for a third-party application that will integrate with the program.
You should be able create and record manual payroll for your employees with these information above. Let me know how things go and if you have other questions with QuickBooks payroll. I'm always here to help. Have a a good one!