Starting over with new Foundation

So I have screwed up my base foundation template. I try to “change Source” when adding a new sheet like “Budget plan” and get an error of “Excel found a problem with one or more formula references”…
What is the best way to transfer data out of my jacked up one to a clean and fresh copy without jacking it up?

Sorry to hear about the workbook corruption.

If you start a new Foundation Template, all of your transactions will reimport… but you will lose information like Categorization and you’d need to port things like budgets and custom category lists.

How far into getting your workbook personalized are you? What data are you trying to migrate?