How to create a template from a Numbers file.

I have Mac Numbers 14.1.

I have a Numbers file that has thirteen sheets (January - December and a separate sheet containing a results spreadsheet.) All thirteen sheets contain tables with results that are summated in sequential sheets and on to the final spreadsheet.

I have zeroed all the cells but preserved the relevant formulas.

I want to use this file as a template to be used for future years.

I know I can create templates for individual sheets but this will not preserve the structure of the entire file.

Is it there a way to convert this file into a template that can be used in the future on a yearly basis?