If you already have the outlining applied, you can protect the worksheet in code
(auto_open/workbook_open??).

Option Explicit
Sub auto_open()
With Worksheets("sheet1")
.Protect Password:="hi", userinterfaceonly:=True
.EnableOutlining = True
End With
End Sub

It needs to be reset each time you open the workbook. (excel doesn't remember
it after closing the workbook.)

If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

dwsmha wrote:

Hello, I have a spreadsheet with multiple sheets, and want to prevent
people from seeing my formulas by protected the sheets. However, I have
data "grouped." If I protect the sheet, people can't click on the "+" to
expand groupings. How do I accomplish both?
David

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Dave Peterson