How to create groups of several rows in sheet (excel)?

[MIB]

How to create groups of several rows in sheet (excel)?
I am trying to create groups form several rows such as:

+1
-2
-3
+4
-5
-6

That I can expand or collapse.

 

[Max]

Select the rows to group,
then click Data > Group & Outline > Group
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Max
Singapore
http://savefile.com/projects/236895
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xdemechanik

 

[Bob Phillips]

Look at Data>Group and Outline>Group...