User Registration Field

[MikeJulian1]

Hello all,

My apologies in advance if this is in the wrong area. I have a question, and was hoping someone could point me in the right direction.
To simplify the scenario, let us say I wanted to provide a new field on the user registration page, called "Favorite"
This field could be a list of two items: color, and number.

I want the following to happen:
The registrant fills the standard default information in, and when they arrive on the "favorite" dropdownlist, they select either color or number.
Upon selection, I'd like another dropdownlist to appear with values filled in depending upon the initial dropdown.

So if I select color, i want the values red,green,blue,etc, to appear in a new dropdown. For number, i'd have 1,2,3, etc, appear instead.

Ideally, i'd l ike this list to come from the categories/subcategories (the stuff people browsing the page see), *not* from some new user fields I create.

Is this possible in a non-programmatic way?
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If not, what would be the effort involved? Edit the template (i know where this is) and simply make my own database calls / implement my own ajax to fill the dropdownlists? That's fine, but as far as saving the data to the database goes, is it just that simple, or are there a lot of other factors involved?

Thanks,
Mike