Combined 32bit and 64bit bootmedia for WinPE

Hello,

I've been using a bootdisk creator (bootwiz) for creating a bootdisks for winpe 4.x. The idea is to bootup from USB drive and deploy either 32bit or 64bit OS from Altiris. The problem is that i cannot create one bootmedia which would fit for 32 and 64bit OS installation. This is possible when doing the Pre Boot configuration in Altiris and using a PXE boot. Anyone knows how to do a bootdisk with both 32 and 64 bit files, as I understood its possible but requires more knowledge than I have.

Thanks in advance.