In Google Analytics, when you have filters on your main view and create a sub-directory view, do the filters also work in the sub-directory view?

If you have a main view and a subdirectory view, both need their own filters. But the good news is you can duplicate them pretty easily.

To learn more about filters and account views, have a look at the 'Getting Clean Data' and 'The Admin Section of Google Analytics' lessons from our  Google Analytics Mastery Course.