forms inside a main form?

Question

I have a problem design my project and don't have a clue of the terms of that problem so I could not google it. Please help. When designing a form, I want users click different buttons and then at certain area of this form, the layout should change, for instance, in form1, we have button1, button2, button3, and an area circuled as a panel, now with clicking a button, certain controls in panel should show up, and disappear when user clicking other button ....... I hope to do this in design view, and I hope I can design somehow sub-form1, 2, 3 (boundaryless), and make it appear within the certain area of form1, something like embedded, change location when form1 changed .... I hope I express myself clear, your help is highly appreciated. Thanks.