We converted from Quickbooks desktoptop to QBO and I need to add 2 months of back payrolls whats the best way to do that

Hi there, @beverhart-fothtu. I've got you the steps to enter previous payroll. 

If you're using the payroll feature,  you can enter prior payroll to record backdated paychecks.

Before doing so, please note that you don't need to enter prior payroll if:

• The business is new and you're paying employees for the first time.
• You're an existing business, but running your first payroll of the calendar year.
• Recently changed your business entity (Employer Identification Number, FEIN), and are running the first payroll for the new entity.

For further guidance, consider checking out this article for the detailed instructions: Set up a prior payroll.

If your service doesn't have this feature, we’ll show you how to manually enter paychecks. You can follow these steps below:

1. Get your employees' payroll pay stubs or a payroll report from your payroll service.
2. Select + New.
3. Select Journal Entry.
4. Under the Journal date, enter the paycheck date.
5. If you want to track the paycheck number, enter it in the Journal no. field.

Refer to this article for further guidelines about this: Manually enter payroll paychecks in QuickBooks Online.

In addition, you'll also want to run a couple of payroll reports after running payroll. This will let you easily review the amounts of the paychecks and liabilities to make sure that everything is accurate and good to go.

Drop a comment below if you have follow-up questions or concerns about processing payroll forms. I'm more than happy to assist you.