How do we set "Is Index?" using Format definition commands?

I've used the following "Format definition commands"
to import fundamental data of symbols:

$FORMAT Ticker, Market, FullName, Skip
$SKIPLINES 1
$SEPARATOR ,
$AUTOADD 1
$NOQUOTES 1
$OVERWRITE 1

But I cannot find keyword to set "Is Index?",
could any one give me a help?

Thank you very much :smiley: !