You can use forms to create new property sheet tabs or to replace existing tab, or to create dialog boxes that are launched from menus or by clicking on buttons in your property sheet tabs. Building a new form is fast and easy, using the form tools in the resource editor.
By default, extended attributes are listed alphabetically on the Extended Attributes tab of the object's property sheet. By creating your own form, you can make these attributes more visible and easy to use, by organizing them logically, grouping related ones, and emphasizing those that are most important. Custom forms are used in PDMs to emphasize the most commonly-used physical options on the "Physical Options (Common)" tabs.
You can create a form on any metaclass that has a property sheet, or on a stereotype or a criterion. For property tabs, if the tab is linked to a stereotype or criterion, it is displayed only when the metaclass instance bears the stereotype or meets the criterion.