Purchases by supplier summary?

Hi there, @ei_lunn.

For now, the option to view purchases by a supplier, in summary, is unavailable in QuickBooks Online (QBO). Although, you can run the Expenses by Supplier Summary report to show your 
total expenses for each supplier every year. 

Here's how:

1. Go to Reports and search for the Expenses by Supplier Summary report.
2. Click the report, then filter its Report period.
3. Select Run report. 

I can see how this option would be helpful for your business. Thus, I'll take note of this suggestion to improve your QuickBooks experience. 

You can also send feedback to our product developers so they can review your request and most like include it in future updates. 

Moreover, you can customise reports in QuickBooks. That way, you can get a closer look into your business. 

Please let me know if you have any other questions in mind. Just add them to this thread and I'll get back to you. Have a good one.