In resource editor, open ClassWizard. Go to "Member Variables" tab, select the variables you want to delete and click "Delete Variable" button.
Recompile your code and fixed member functions that uses the variable.
You can associate more than one type of object to each control. For example, for an Edit control, you can associate it to a CString type of a CEdit type. Depends on your usage, you normally needs one or the other, hardly both. If you only use standard windows feature like GetWindowText and SetWindowText, you don't even need to associate the control to any variable, just use GetDlgItem(…)->GetWindowText(…).
I am not sure if this really help.
Shyan