To add an object to a WorkSet using a WorkShop menu, choose New from the menu. When you open a new item, it is automatically added to the menu picklist and the current WorkSet. To remove an item from a menu picklist (and therefore from the current WorkSet), choose Remove item from menu where item represents the object controlled by the menu. When the file chooser appears, select the item or items you want to remove.
For more information about creating, editing, or modifying WorkSets, see "Using WorkSets" in the Sun WorkShop online help.