Is there a way to give a user access to the underlying transactions from a custom P&L report?

The option to assign a user role that allows viewing a custom Profit and Loss (P&L) report without the ability to edit transactions is currently unavailable, ktrainor.

On the other hand, you can explore using the View Company Reports user role as an alternative. This role enables a user to access all reports, except for payroll but restricts the ability to view the underlying transactions associated with these reports.

For a complete list of user roles and their access rights, please refer to this article: User Roles and Access Rights.

You can also refer to this article to manage a user from your account: Add, manage, or delete users in QuickBooks Online.

If you have additional questions about user roles in QuickBooks Online, feel free to visit the Community page.