Hi, @BeekeepingSuppliesUK.

Thanks for posting your concern here in the Community. Let me share some insights about importing products in QuickBooks Online (QBO). 

I understand how importing a bundled product using a CSV file in QBO would be beneficial for your business. Currently, this is only applicable to banking transactions. 

In the meantime, you can move your products and services info from Excel and import it to QBO. To do this, you can follow the detailed steps in this article: Import products and services from Excel. 

I also make sure to take note of your request and will inform you once we we receive product enhancement update about the availability of this option. 

For future reference, you may want to check this article to learn more about the list and transactions that you can export/import in QBO using CSV file: Import/export CSV files. 

Please know that you're always welcome to post if you have any other concerns about import/export in QBO. I'll be around to help. Have a nice day!