Hi there, @Anonymous.
Please allow me to help share a little more information about the running the Profit and Loss report.
The Profit and Loss (P&L) report summarizes or shows your income and expenses to know whether your business is operating at a profit or loss.
When creating a bill under the Items tab/column, the accounts affected of the item are Accounts Payable and the account on the item selected (Service, Inventory, and others). However, when creating a bill under the Expenses tab/column, the accounts affected are Accounts Payable and the Expense account selected.
The reason why the bill entered under the Items column is not showing on the report because it doesn't affect any expense account.
On the other hand, to see all the bills you've created either under the Expenses or Items tab, you may run/open the Transaction List by Vendor report and make the necessary customization.
To open the report:
To learn more about running reports in QBDT, you can check this article: Understand reports.
Please feel free to add a comment below if you have any other QuickBooks questions, I'd be glad to keep helping. Have a great day ahead!