Would it be possible to add nested drop-down lists as custom user-fields during registration? I.e. A user will pick their country of residence from a drop-down, and in the second drop-down for state, they'd then only see the applicable states for that country. I.e. Combo-Box 1 - Country: UK US Combo-Box 2 - State: US - Alabama US - California UK - Scotland UK - Wales Selecting US in combo-box 1 would only display Alabama and California in combo-box 2. I've been looking at the custom-fields part of the admin panel, and have not seen it can be done in there. Would this require an add-on?