Here are 4 different macros from Gord Dibben:
Option Explicit
Sub AbsoluteCol()
Dim Cell As Range
For Each Cell In Selection
If Cell.HasFormula Then
Cell.Formula = Application.ConvertFormula _
(Cell.Formula, xlA1, xlA1, xlRelRowAbsColumn)
End If
Next Cell
End Sub
Sub Absolute()
Dim Cell As Range
For Each Cell In Selection
If Cell.HasFormula Then
Cell.Formula = Application.ConvertFormula _
(Cell.Formula, xlA1, xlA1, xlAbsolute)
End If
Next Cell
End Sub
Sub AbsoluteRow()
Dim Cell As Range
For Each Cell In Selection
If Cell.HasFormula Then
Cell.Formula = Application.ConvertFormula _
(Cell.Formula, xlA1, xlA1, xlAbsRowRelColumn)
End If
Next Cell
End Sub
Sub Relative()
Dim Cell As Range
For Each Cell In Selection
If Cell.HasFormula Then
Cell.Formula = Application.ConvertFormula _
(Cell.Formula, xlA1, xlA1, xlRelative)
End If
Next Cell
End Sub
If you're new to macros:
Debra Dalgleish has some notes how to implement macros here:
http://www.contextures.com/xlvba01.html
David McRitchie has an intro to macros:
http://www.mvps.org/dmcritchie/excel/getstarted.htm
Ron de Bruin's intro to macros:
http://www.rondebruin.nl/code.htm
(General, Regular and Standard modules all describe the same thing.)
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Then you'll have to select the range of cells to fix and then hit alt-F8 (to see
the macro dialogs), pick the one you want and run it.