Entering Revenue numbers

A pleasant day, @Mark WC.

I'll help you show the revenue numbers generated by your other program in the QuickBooks Profit Loss Statement.

You can manually enter the transactions through a sales receipt or bank deposit. Then, utilize a category that affects income accounts so it will show in the QuickBooks Profit and Loss Statement. 

Here's how to enter the Sales receipt:

1. From the + New, select Sales receipt.
2. Pick a Customer. If you haven’t set up your customer, click + Add new.
3. In the Select a product/service ▼ dropdown, choose the product or service that you sold.
4. (Optional) You can edit your line item’s quantity or rate in the Qty and Rate field.
5. Fill out the other necessary fields in the sales receipt, then select Save.

For more info, please read this article: Create sales receipts in QuickBooks Online.

On the other hand, you can input transactions through a bank deposit. Check out this article for detailed steps: Record and make bank deposits in QuickBooks Online.

Furthermore, you can connect your bank to QuickBooks so transactions will flow on the banking page. Or manually add transactions directly to an account so it will show in the Profit and Loss statement.

Also, requesting a CSV file from your other program will be of great help to import the transactions into QuickBooks. Then, you'll only work on categorizing them to the correct accounts.

Check out this article on how to run a Profit and Loss report that shows a comparison from another period: Run a Profit and Loss Comparison Report in QuickBooks Online and Online Accountant.

Click the Reply button below if you have additional questions about showing your Profit and Loss statement in QuickBooks. I'll be willing to lend a hand. Keep safe, and have a good one.

@Mark WC 

@Bryan_M 's response of using bank deposits or sales receipts assumes you're receiving payment at the time of the sale.  That works if you actually receive payment at the time of the sale or you use the cash basis method of accounting.  If you're on accrual basis, you will need to enter invoices so A/R offsets your revenue.