Dynamic drop downs without using Database

Hi I'm switching from bubble to FF. In Bubble I have the option to save options to the app itself via option sets. These are often quicker than reading from a DB.

Hence I can create a drop down with 2 choices then another drop down with corresponding choices which are dynamically based on the choices of the first one.

How can I do this using Flutterflow?

How can i select one of two options in one drop down which will affect the choices available in another drop down without using the DB?

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