How do I add the prior period to a a profit and loss comparison report?

Welcome to the Community space, @rizrotex.

I'm here to assist you in adding the prior period to a profit and loss comparison report in QuickBooks Online (QBO). 

Here's how:

Step 1: Get a Profit and Loss Comparison Report

1. Go to Reports 
2. Enter Profit and Loss Comparison in the search field. You can also find the same report under the Standard tab.
    

Step 2: Customize your report.

By default, Profit and Loss Comparison Reports show the current year-to-date and the same period last year. You can change the length of time and dates as needed.

1. In the Report period dropdown, select the length of time you want to see.
2. In the date field, select the start and end dates.
3. In the Compare another period dropdown, select the Previous Year checkbox to see the same timeframe and dates last year. Or, if you want to see the last period for the length of time you selected, select the Previous Period checkbox.
4. In the Accounting method section, select Cash or Accrual.
5. When you're ready, select Run report.

Tip: You can also select Customize to add columns or filter for specific info.

Moreover, I'll be sharing the following resources to help personalize and manage your reports in QBO:
 

Memorize reports in QuickBooks Online.

Customize reports in QuickBooks Online.

Feel free to reach out if you need any additional assistance or guidance regarding your Profit and Loss Comparison report. Best of luck with your financial transactions. Keep Safe!