Ability to deactivate SEO index for all subpages

It would be great to have the ability to deactivate SEO index for allsubpages when you deactivate SEO inedx for the parent page.

For exemple let's say I have a page containing a database with the name of some of my customers.
I don't want for thoses names to be indexed. So I deactivate SEO index for the parent page but I also have to deactivate SEO index for every subpage in the database.

With my idea, you deactivate SEO index for the parent page and every subpage in the database is the deindexed too.