SubForm Object [Access 2003 VBA Language Reference]
This object corresponds to a subform control. The subform control embeds a form in a form.
Note For example, you can use a form with a subform to present one-to-many relationships, such as one product category with the items that fall into that category. In this case, the main form can display the category ID, name, and description; the subform can display the available products in that category.