If you already have the outline 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
.EnableAutoFilter = True
End With
End Sub

(I wasn't sure what caused your outlining--data|Group or Data|subtotals).)

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

carlyman wrote:

I want to protect a worksheet; however, I don't want to lose the ability
to collapse/uncollapse rows that I have grouped together.

What option needs to be checked when locking the sheet to allow this?
Or, is it not possible?

Thanks,
JC

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Dave Peterson