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Hi there,
so how are you storing that data in the form? Are you using arrays within arrays, or maybe JSON objects? How do you determine what item list to use when a value is selected?
Once you have selected a value within the first drop down, by extracting the correct items you will populate the next drop down, either by using setItems for the whole array object or addItem for each items from your collection.
When a value is changed from a "Previous drop down", you may want to reset the following drop down values in case the item value doesn't exist anymore.
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