Congrats on making your first post here in the Community. Let's work together and get a better understanding of why the expenses on your Profit and Loss by Customer report are showing as "non-specified."
The reason why is that it will show all the vendors/COGS transactions as non-specified due to the report being only for customer's transactions. If there's no customer name on the transaction, then it will be listed as non-specified. However, you can check out the Expenses by Vendor Summary report for more details about expense transactions. Here's how:
Go to the Reports tab.
Select the Reports section.
Scroll down until you see the Expenses and Vendors portion.
Choose Expenses by Vendor Summary report.
It's that easy. You can cruise on over to this article about customizing reports to get more insight into the Reports page.
Should you need any further information about running reports, just let me know. The Community is always here to have your back. I'm only a comment away. Take care!