Did you know that you can place a form onto a panel on another form?
Here's how (trying to recall it from memory):

MyForm* f = new MyForm;
   // for C++/CLI, replace * with ^, new with gcnew
f->TopLevel = false;
   // this is a must for placement on a panel on another form
f->Dock = System::Windows::Forms::DockStyle::Fill;
   // fill its parent, the panel
this->panel1->Controls->Add(f);
   // place "f" on a panel on the current form
f->Show();
   // I think you need this too

So you can break a large form into several smaller sub-forms, and put
them together in the application's main window. It's often better than
building huge monster forms, especially if you can reduce or completely
eliminate inter-dependencies between the individual sub-forms. In case
the sub form's caption shows up, I know you can disable that easily. I
don't remember all the details off the top of my head.

If the sub-form is something that you plan to reuse in many projects,
you can try to create a control library for that. Otherwise it's not
necessary for the concept to work.

Tom