How do you create a "corporate" budget for the year after creating 3 individual "location" budgets (3 stores) ????

I'll provide a few information when creating a budget, NigelWood.

Currently, consolidating all  locations in one budget is unavailable. QuickBooks will only allow you to create per location (subdivided) when creating budgets. 

You can send a request to let our product team know how this is useful for your business. To do so, follow the steps outlined below:

1. Go to the Gear icon, then Feedback.
2. Enter your comments or product suggestions. Then select Next to submit feedback.

This goes to our Product Development team to help improve your experience in QuickBooks Online. You can track feature requests through the QuickBooks Online Feature Requests website.

In the meantime, you can export reports from QuickBooks Online to Excel and consolidate them into one. To export, follow these steps:

1. Go to Reports.
2. Search for and select the report you want to export.
3. Select the Export icon. Then select Export to Excel.
4. Save the file somewhere you can easily find, like your Downloads folder or your desktop.

Furthermore, QuickBooks provides different kinds of reports that cater to your business needs. You'll only have to customise them to ensure you'll get the data you need. I've got this article for reference: Customise Reports in QuickBooks Online.

Please keep in touch if you have any other concerns about creating a budget. We'll always be right here to help. Have a nice day!