You can add your custom entries in /ubcd/custom/custom.cfg (or in the UBCD config files /ubcd/menus/syslinux/)
For Windows 7/Vista, you need this:
Code:
LABEL win7
MENU LABEL Boot Windows Vista/2008/7 (bootmgr)
COM32 /boot/syslinux/chain.c32
APPEND ntldr=/bootmgr
You can't add Ubuntu live in its original form (with the nice boot menu), but if you know which options you select to boot it, I can try to give you the right command line.
Which version of Ubuntu?
You can read how the boot entries work, by donwloading the Syslinux package and by reading the documents in /doc.
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Download
Ultimate Boot CD v5.0:
http://www.ultimatebootcd.com/download.htmlUse
Parted Magic for handling all partitioning task:
http://partedmagic.com/