To do this, enter Design Mode, and open the Form Navigator. In the Form Navigator, drag a form (that will become a sub-form) onto any other form (that will become a master). The user of your document will not see that a form has sub-forms.
创建窗体后，可将该窗体转为子窗体。要实现这一点，请输入“设计模式”并打开“窗体导航”。在“窗体导航”中，将一个窗体（将成为子窗体）拖放到其他窗体（将成为主窗体）上。