Yep, just like zef posted. The one that needs semicolon separating volumes is Rename Partition, like:<key>Rename Partition</key>
<string>hd(0,6) OS X Install; hd(0,7) Test</string>
And the disk order to use is the one Chameleon shows at the prompt. For instance, to hide the first partition on my first BIOS HD (disk0) i have to use Hide Partition=hd(1,1), because that's what Chameleon sees. This is with the booter installed to a local HD.. if on a external HD the order is the same as the BIOS one.