Hello there, mangoMan.
You can run the Item Actual Cost Detail report. Before doing so, let's make sure to enter the name of the vendor and other details when creating a bill.
See the sample screenshot below:
To know more about customizing the report, you can check out this article: https://quickbooks.intuit.com/learn-support/en-us/memorizing-reports/customize-reports-in-quickbooks....
If you have additional questions about running the reports, let me know. I'm here to help.