In order to create a jumpstart image containing all the Solaris software, you first create an image like before from the Solaris 1of2 CD.
Then you mount the Solaris2of2 CD and run
Solaris_*/Tools/add_to_install_server /path/to/image/directory
If you want, you can also add the langcd to the install image.
It's perhaps easier to use the install DVDs; those can also be unpacked on the other architecture. SPARC and x86 CDs can only be unpacked on SPARC and x86 systems, respectively.