How to get cost to as actual cost in each line item that I entered as bills? On the estimate vs actual cost report, it is lumping the actual cost into not specified

I can share some information about the cost showing in the not specified section, @knassiri. 

Usually, these are transactions that we're not assigned with class. I suggest going back to these transactions and add one. For detailed guidance on how to assign a class, check out this article: Create and manage classes in QuickBooks Online. 

Refer to this article for more information on how to show specific accounts, customers, or any other information on your report: Customize reports in QuickBooks Online. 

Let me know if you have further questions about your report. I'm always here to help. Keep safe, and have a wonderful day!