Q:  I have a form that is a sort of template.  I want to be  able to create and show the same form several times (with  different data in the fields).  How do I use the same form several times?

A:  You need to make modeless window by calling create and show for each form instance, like this:

with TMyForm.create(self) do show;

To demonstrate how to use and control these new forms, here is  an example that changes the caption and name of each form that  is created.  You have access to it through the form's component  array.  This example uses an about box (named "box") as the  other form.  Also, there is a variable called "TheFormCount"  that keeps track of how many times the form is instantiated.
 

procedure TForm1.Button1Click(Sender: TObject);
begin
  with TBox.create(self) do begin
    Name := 'AboutBox_' + intToStr(TheFormCount);
    caption := 'About Box # ' + intToStr(TheFormCount);
    Show;
  end;
  inc(TheFormCount);
end;

These forms can be found and used by their name by means of the  FindComponent method used something like this:

with Form1.FindComponent('AboutBox_' + IntToStr(Something)) as TForm do
    DoSomethingHere;