This requires either the use of keyboard shortcuts ... or using the mouse and clicking menu selections. You can also create a macro that, once the affected cells are selected, will convert all those cells at once.
Not tested here :
Code:
Sub ConvertToValues()
Dim MyRange As Range
Dim MyCell As Range
Select Case
MsgBox("You Can't Undo This Action. " & _
"Save Workbook First?", _
vbYesNoCancel, "Alert")
Case Is = vbYes
ThisWorkbook.Save
Case Is = vbCancel
Exit Sub
End Select
Set MyRange = Selection
For Each MyCell In MyRange
If MyCell.HasFormula Then
MyCell.Formula = MyCell.Value
End If
Next MyCell
End Sub