I kind of agree with anonymous. I like to show the Formula Auditing toolbar and
just click the icon to show the precedents/dependents.
But if you could live with a small macro, you could select the range you want
(or ctrl-A for the whole sheet) and run it:
Option Explicit
Sub testme01()
Dim myCell As Range
Dim myRng As Range
Set myRng = Nothing
On Error Resume Next
Set myRng = Intersect(Selection, _
Selection.Cells.SpecialCells(xlCellTypeFormulas))
On Error GoTo 0
If myRng Is Nothing Then
MsgBox "Please select some cells with formulas"
Exit Sub
End If
Application.ScreenUpdating = False
For Each myCell In myRng.Cells
myCell.ShowDependents
myCell.ShowPrecedents
Next myCell
Application.ScreenUpdating = True
End Sub
If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm