Using ForEach to target files in sub-sub folders

I have a series of folders that each have sub-folders. Within each of those sub-folders are txt files that I'm trying to perform actions on (see example screenshots). I know how to use ForEach to perform actions on all files of a specified type in a single folder, but is there a simple way to iterate through sub-folders as well?

For Each action has a recursive option that might help you. See this thread:

Wow, this is exactly what I needed (and I'm also using it for a search & replace functionality, awesome). THANK YOU!