SubForm Visibility

Hello-

I would like to design a form for data entry which, when a button is
clicked, a specific sub-form is loaded/visible.

I have 2 sub-forms that need to be completed, however I want the user to be
able to toggle between the two.

However, I don't want the user to be able to see the sub-form that they do
not need to use until they are ready to use it.

So- I'd like my toggle button to make either the one form visible, OR the
other form visible, but not both at the same time.

Thanks.