How do I make hierarchical structure in Firebase if I have different screens?

Hi. I would like to know how to make hierachical structure in Firebase if I have different screens. I have came across videos where they use the 'start value' to bring the data over to the next screen. However, that doesnt seem to work when you have more than 2 screens.. Btw, I am new to this whole thing so any simple methods would be nice. Thank you in advance!

Use different screens wisely

If you decided to use different screens, then you should switch them correctly, else you will run out of memory after a while...      
The recommended method of switching screens in App Inventor
(Thanks Taifun)
Also see demo: multiscreen.aia

Thank you for the suggestion! I will try with using a single screen.