A subform is a section in the form design that provides anchoring, layout, and geometry management for objects. The objects in a subform can be arranged in rows, columns, or some other kind of balanced arrangement.More than one subform can be used in a form design. Subforms can be placed inside other subforms. This relationship is displayed in the Hierarchy palette.Subforms are used to organize a form into different sections. They can also be used to create a form that contains sections that automatically expand and shrink to accommodate the data. If you set a subform to grow, the layout of the form changes in response to the amount of data that is merged when the form is rendered. When the data is merged, subforms ensure that objects and their data are positioned consistently relative to each other. Subforms can be used to match the data hierarchy in XML data.If you are designing a form that has a fixed layout, it is unlikely that you will need to work with more than one subform because the default subform positions the objects automatically.You can manipulate the properties of a subform in the Subform and Binding tabs of the Object palette. You can define these properties: