You can create a relationship at database. The dynamic values for second dropdown will to be a result of the “Search” of the value selected from the first dropdown.
Is there any tutorial videos or documentation on this?
I found https://www.youtube.com/watch?v=_w2TYIiI2i0 But this is already achieved using constraints/filters. It doesn’t cascade the filter from one to another dropdowns. The unrelated choices are still shown (which should not be the case)