Is it possible to create option groups within a dropdown?

Is there a way to create an option group subheading and indented sub-selections in a dropdown list?

In HTML it would look like this:

                <optgroup label="Crime Prevention">

                       <option value="Central">Crime Prevention: Central Division-</option>

                       <option value="Foothill">Crime Prevention: Foothill Division-</option>

                       <option value="Southern">Crime Prevention: Southern Division-</option>

                       <option value="Western">Crime Prevention: Western Division-</option>                       

                    </optgroup>

 -Dave

Yes, that's possible. 

To create a group, enclose the text with double square brackets.

Example:

[[header]]

option 1

option 2

Result: