Doc/View question

   I have reached a point where I need input on the following:
For some time I have used MFC created apps with Doc/View
and made my base view class as CFormView. It was
convenient and quick, but I was putting all of my data variables in
the ViewClass since that was where the class wizard put all my
control variables and it seemed convenient in my ignorance. If I
had to access files I used ofstream from within my view class.
  So now it has become apparent that I have things backwards
(so it appears from what I read ) in that I should have been creating
data variables in the CDocument class.
    My problem in understanding some of the logistics is that I see
plenty of example code "getting" data into the view from the document,
but I don't see much on getting the user input from the view to the
document. At first I thought I could just make the view class a friend
of the document, but I think maybe that is not the way it is done. So
I am assuming you get a CDocument ptr as I have at the bottom of
shown code below, (appreciate all comments on my understanding
of theory (or not understanding ) and code criticism of how I am
attempting to feed input data to variables in Document class.

CMyView::CMyView() // start of predicated view code
 : CFormView(CMyView::IDD)
{ // Edit Control Variables
  //{{AFX_DATA_INIT(CMyView)
  m_Invert_In_1 = 0.0;
  m_Invert_Out_1 = 0.0;
  m_InletNum = 0;
  //}}AFX_DATA_INIT
}

CMyView::~CMyView()
{
}

void CMyView::DoDataExchange(CDataExchange* pDX)
{
  CFormView::DoDataExchange(pDX);
  //{{AFX_DATA_MAP(CMyView)
  DDX_Text(pDX, IDC_Invert_In_1, m_Invert_In_1);
  DDX_Text(pDX, IDC_Invert_Out_1, m_Invert_Out_1);
  DDX_Text(pDX, IDC_ItemLabel, m_InletNum);
  //}}AFX_DATA_MAP
} // end of predicated view code

void CMyView::OnEnter() // Begin question code area
{
  UpdateData(TRUE);
  // Code here is asking for comment and design theory input //
  // I am moving edit control variables input to my data variables
  CMyDoc* DocPtr = GetDocument();
  DocPtr->InletA->dInvert_In_1 = m_Invert_In_1;
  DocPtr->InletA->dInvert_Out_1 = m_Invert_Out_1;
  DocPtr->InletA->uiInletNum = m_InletNum;
}
--------------- predicated variables in document class
class CMyDoc : public CDocument
{
  protected: // create from serialization only
  CMyDoc();
  DECLARE_DYNCREATE(CMyDoc)

// Attributes
  public:

  struct Inlet
   { double dInvert_In_1;
     double dInvert_Out_1;
     unsigned int uiInletNum;
   };

  Inlet InletA;
.................rest of document class......