It's not clear if you want all three forms visible at the same time on one form?
You mentioned the tab control, so my assumption is you want to switch between the three forms, like on a tab control, but without the tab control.
It's important to know how a subform comes about. It's just an ordinary form! There's nothing special about it, except that it's housed in a control called a subform/sub report control.
I like to term this control "a window" because it's like a window pane in your main form and you can look into another form through the window.
Once you have established this window on your form you can put any form you like in it with VBA!
So an alternative method would be to switch forms with VBA code with command buttons or a combo box.
