I'll give you an overview of the supplier report that I'm going to provide, wilchas52@gmail.
In QuickBooks Online, we have the Transaction List by Supplier report. This is a single report that displays your transactions, grouped by supplier. To run the report for each supplier, you will need to filter the data.
Here's how:
Go to Report on the left panel.
Type Transaction List by Supplier in the search field.
Set the Report period and click the Customise button.
Select the Filter section and choose the specific supplier from the Supplier drop-down menu.
Hit Run report.
I've got this sample screenshot for a visual guide:
Once done, you can either click the Export or Save customisation button. This will give you the option to export the data to Excel or add each report to the Custom Reports page. Here's a sample screenshot to see what it looks like:
To learn more about the different reports in QuickBooks Online, you can read these articles: