We've just released a small update to Form Wizard Pro that adds support for grouping items in a dropdown list question.
The form editor also shows the grouping and allows assigning and editing groups on items.
Note that this release of Form Wizard Pro requires mojoPortal 2.3.9.9 (released yesterday) because the support for grouping items was implemented in the mojoDropDownList and mojoListBox controls which are part of mojoPortal. These controls extend the ASP.NET DropDownList and ListBox controls which don't provide any support for grouping.
As usual this is a free update for customers who already purchased Form Wizard Pro and can be downloaded from your purchase history by logging in as the user who made the purchase and clicking the "My Account" link at the top of the page, you'll find it under the "Order History" tab.
If you don't already have Form Wizard Pro, check out the product page, it is an essential add on product for easy custom forms and simple surveys in your web site powered by the free mojoPortal Content Management System.