multiple winpe images boot from linux pxe

Hi

I followed the steps given in following URL to setup winpe boot from linux pxe( as part of my automatic Windows install).

http://technet.microsoft.com/en-us/library/cc722358%28v=ws.10%29.aspx

It works fine but it allows to boot only one winpe.wim from linux pxe server.

My requirement is to install different flavors of Windows OS. To have multiple Winpe images, I can make multiple entries in BCD file, but that would require manual interference every time.

I am not able to find any way to boot different winpe.wim, because bootmgr.exe always look for BCD file in /boot folder inside tftp root folder.

Please suggest some ideas.