How/where do I find how to create a statement of the purchases and payments we have made to a supplier/

Hi MBG,

QuickBooks offers a variety of reports which show you a snapshot of how your business is doing. I'd be happy to give you a hand with showing you how to run reports which show the info you're looking for. 

At this time, you can run customer statements and not supplier statement. I suggest check out this article to learn more about: Creating and viewing customer statements.Based on what you've described, I recommend running a checking the available reports by clicking Reports from the left menu > scroll down to Expenses and suppliers. From here you can select the report which works best for you. If you need to customize a report, check out this article here. 

I hope this info helps. In case you have other questions, feel free to contact our support team using this link here.