1.
The content of config.sys:
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[menu]
menuitem=Win98
menuitem=Etherboot
menudefault=Etherboot,7
menucolor=7,0

[Win98]

[Etherboot]

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2.
The content of autoexec.bat:
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@ECHO OFF
IF "%config%"=="Win98" GOTO Win98
IF "%config%"=="Etherboot" GOTO Etherboot

:Win98
GOTO QUIT

:Etherboot
eb-net.com
GOTO QUIT

:QUIT
echo Let's rock!
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