Adjusting Center Across Selection with a Cell Value

Jean likes using the "Center Across Selection" setting on the Alignment tab of the Format Cells dialog box to center information across un-merged cells. She wonders, though, if there is a way she can use the contents of one cell to control across how many cells the centering occurs. For instance, if she has the number 4 in cell A1, then the centering would be across 4 cells (B1:E1), but if she changes it to 5 then the centering would be across 5 cells (B1:F1).

The only way this can be done is through the use of a macro. Because you might change the value in cell A1, the macro needs to run whenever you make a change to the workbook and then determine if that change was made in cell A1 or not. If so, then it can make the adjustment to the cells in the row.

Private Sub Worksheet_Change(ByVal Target As Range)
    Dim r As Range

    If Target.Address = "$A$1" Then
        Set r = Range("B1")
        r.EntireRow.HorizontalAlignment = xlGeneral
        r.Resize(1, Target).HorizontalAlignment = xlCenterAcrossSelection
    End If
End Sub

Note that this macro is placed in the code sheet for the worksheet you want to affect. (Right-click the worksheet's tab and choose View Code.) Whenever a change is made in the worksheet, the macro automatically runs. To make it work for your needs, change "$A$1" to the address of the cell that contains how many columns you want to center across. (This needs to be a full address, including the dollar signs.) You'll also want to change "B1" to the address of the first cell at the left of the range where the centering is to occur. (This address does not require the dollar signs.)

The macro sets the value of the r Range variable to your starting cell. It then sets the alignment of all the cells in the row back to general. Finally, the size of the range is adjusted to be just as wide as you specified and the alignment of the range is set to xlCenterAcrossSelection to give the desired results.

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