Validating based on different fields

I am trying to find a way to validate certain fields based on whether
not another field is filled/ selected.

I have a drop down that depending on which item is selected will
expose other form fields. I need to validate the fields that are
exposed for the selected item, and not the others.

Does that make sense?

I dont know if I can do some conditional statements in the model to
test for which item is selected.

Any help would be greatly appreciated.
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