Actually, the macro would change the groupname of all the optionbuttons on a
sheet to that sheet's name.
If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm
Short course:
Open your workbook
Hit alt-f11 to get to the VBE (where macros/UDF's live)
hit ctrl-R to view the project explorer
Find your workbook.
should look like: VBAProject (yourfilename.xls)
right click on the project name
Insert, then Module
You should see the code window pop up on the right hand side
Paste the code in there. Modify this line for the worksheet that you're fixing.
Set curWks = Worksheets("sheet1")
Now go back to excel and test it out--Tools|macro|macros...|Run