Objects in the subform are positioned during the data-merging process so that no objects are rendered on top of each other. Subforms that flow content are placed in ascending order. You can use subforms that flow content when you need the form to automatically expand to fit the contents.The root subform (form1) is set to flow content by default. The root subform always flows content according to the flow direction option that you apply to the associated default content area. Because the root subform is set to flow content, all subforms nested under the root subform automatically flow, as needed, from one form page (content area) to the next when data is merged. When the form is rendered, the subforms under the root subform are placed in descending order according to their position in the object hierarchy.You can set any other subform to flow content as well. Each subform that is set to flow content can hold varying amounts of data, whereas the objects within the subform move together during the data-merging process so that none of the objects interfere with each other.You use the Flow Content option in the Type list in the Subform tab to flow content in a subform. When you select the Flow Content option, the objects are positioned based on the Flow Direction option you select. Notice that the Flow Direction list and the Allow Page Break option are enabled after you select Flow Content in the Type list.