It took me a couple of minutes to get my head around your post, but I think this is what you want:
code:
$iTotal=3
$sVar1="String 1"
$sVar2="String 2"
$sVar3="String 3"

For $iCount = 1 To $iTotal
 $sNull=Execute("$$sNewvar=$$sVar"+$iCount)
 "$$sNewvar="$sNewvar ?
Next