The use case having two input elements, in which second select input depends on the first one; so when first one is updated, options on the second changes.
Conceptually; both of these elements are pretty technical to understand, so initially it is not clear that one of them depends on the other.
A common pattern I can think of; is to have the second select input disabled until an option from the first one is selected, but in my case both of the input elements must have options selected by default.
What are some subtle visual approaches I can use to communicate this, before resorting to explicitly explaining it with microcopy?