Moving from Test Smartsheet to using real data - Smartsheet

This Community is awesome. Thanks for all the help you didn't know I got from here. This is a question whose answer I can't find.

We recently created a Smartsheet for tracking procurement data. In testing, we've used 15 or so rows. It doesn't appear I can delete the rows and start from Row 1 and have the built-in Smartsheet ID (auto number) begin with 1. The Smartsheet ID wants to count the test data to assign an ID, but it steadfastly refuses to do that.

Can I just overwrite the test data with real data without complications from the test data?

Should I copy the Smartsheet as a new sheet and start fresh?

Thanks for your recommendations.