Categories and sub-categories in Custom Fields
Is there a feature in the Custom Fields wherein, for example, user selects "iPhone" in Phone brand select menu, he can choose "iPhone 3" in the following Phone model select menu and not list those phones that aren't with the iPhone line of models. If he chooses Samsung, then only Samsung models will be listed. I believe this is available when the user selects a category then the subcategory will be listed during the posting of an ad. What I'm asking is, can this be done on the Custom Fields?
A client wants that feature so I will know if there will be modifications to be made when they purchase ClassiPress.