ie
If selection in field A = XXXX, then Field B shows drop list or checklist 1
If selection in field A = YYYYY, then Field B shows drop list or checklist 2
If selection in field A = ZZZZZ, then Field B shows drop list or checklist 3
Currently can have Field A and B, but B would need to contain all the list entries from 1, 2 and 3 - therefore miss matches are possible
Rough Example:
Field A (Device) : Mobile/Tablet/Desktop
Field B (Browser)
If Mobile: IOS/Android
If Tablet : IOS/Android
If Desktop: Firefox/Chrome/IE/Edge/Safari