Add snippet to all child pages selecting only a parent page

Hello,

I have an A/B testing website and each group of tests need a specific snippet. It is really awesome to be able to select which pages I want the snippet to be inserted into but I was wondering if it was possible somehow to insert snippets to all children of a certain parent page, or something similar, something easier so each time we generate a new page we dont forget the snippet. This way, the process is way smoother when creating A/B tests and making sure each page has the correct code.

Thank you very much for your time :heartemoji: