If you are using a content control (e.g., one titled "TextCC") then you don't need a bookmark for this:
Code:
Option Explicit
Private strVal As String
Private Sub OptionButton1_Click()
If Me.OptionButton1.Value = True Then
ActiveDocument.SelectContentControlsByTitle("TextCC").Item(1).Range.Text = strVal
End If
End Sub
Private Sub OptionButton2_Click()
If Me.OptionButton2.Value = True Then
strVal = ActiveDocument.SelectContentControlsByTitle("TextCC").Item(1).Range.Text
ActiveDocument.SelectContentControlsByTitle("TextCC").Item(1).Range.Text = vbNullString
End If
End Sub