Change Total Formulas For All Tables At Once To Show Either Year-to- Date Or Total Year

I have a sheet in my workbook with at least 180 small tables, there may be more.
I woulds like to be able to change total formulas for all tables at once to show either year-to- date or total year.

For example:
If we have only progressed through the second period of the year, I would like to choose something to indicate period 2. At other time I may want to know the total year whether the periods are completed or not.