imaging rule bios version number

We are trying to image several labs by multicasting. These workstations
have no operating system on them. We would like to do it in ConsoleOne by
setting a rule using the bios version number. We create the session and
then try to set the rule for workstations to participate. The drop down
window for the rule includes bios asset number and bios serial number but no
bios version number. Is there a way to get the bios version number to show
up as a choice in the drop down window for the rule? If so, we could use
some instructions.

Thanks
Lee Mills