hmm ..not sure what you mean by parent-child relationship, maybe.
What I mean is say we have 2 attributes both defined as dropdowns > the values that show in the second dropdown should depend on which option I selected in the 1st dropdown.
example:
attribute1 has possible values "Green"/"Yellow"
if I choose "Green" the second attribute should show in the dropdown the values "Broccoli" and "Peas" but if I pick "Yellow" in the 1st attribute, the second one should show for ex "Banana", "Lemon", "Pear" (values one can select from)
You know what I mean?