add images to install.wim Windows 7

I have a windows 7 ultimate 32 bit 7600 dvd.There is no ei.cfg file. I want to make it a universal disc. but there is a file called "install_Windows 7 ULTIMATE.clg" in the sources folder.
I checked the install.wim file with imagex.but it only contain one image of ultimate. Is tere any way to make a universal disc from it (only 32 bit) by adding other images to install.wim

You can edit a wim file using Imagex which is contained within the Windows Automated Installation Kit (WAIK) from here:

Download: Windows AIK User's Guide and Unattended Setup Reference (Documentation Update 1) - Microsoft Download Center - Download Details

I know i can edit it but where can i get the images to merge to the WIM file