Conditional fields or field-options

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3

I would do it like this

  1. it is possible to add CSS class in easyform, the same was as it is with all XML schema content types (see link below).

  2. Set ID (or a class) on the 'master' to for example 'trigger1'

  3. Set class on the 'children' you want to be triggered to 'trigger1'

  4. Make a js that finds the id or class of the master and then hides children that does not have this class

NOTE: I have looked, but not found any way to set 'data stuff' in xml ( Setting pat-stuff in xml )