Here is an example with a RefEdit control on a User Form.

[vba]
Option Explicit

Private Sub CommandButton1_Click()

Dim Rng As Range

Set Rng = Range(Me.RefEdit1.Value)
Sheet1.OLEObjects.Add "Forms.Checkbox.1", _
Left:=Rng.Left, Top:=Rng.Top, Height:=Rng.Height, Width:=Rng.Width

End Sub
[/vba]

You can then add a Select Case to determine what control to add (based on user input).