c# Converting part of form into a child


I have a Visual Studio (15,19) C# form with several grouped fields (in GroupBoxes).
I wish to convert some such groups into mainform’s children, accessed by menuestrip.
I can easily make the main form into parnet and add menuestrip items, but I don’t know if there is a simple way to convert a whole group into a child.
For example, I have in the main form a group that sets serial port’s parameters: Port, boud, parity, etc. and I wish to move the group out of the main form and make it a form’s child that can be opened by the menuestrip or by command from the main form.

Source: Visual Studio Questions