I just figured it out.
Here is what I did:
Load Lion and open terminal. Type diskutil list
You will then see all the dives listed with a "code" something like
"Windows_NTFS My Drive disk1s2"
Open the org.chameleon.boot.list file in the /Extra folder.
Type in the following XML lines:
<key>Hide Partition</key>
<string>hd(1,2) hd(1,3)</string>
where (1,2) is the corresponding numbers from the diskutil list command you made earlier. In this example, you would hide the Windows_NTFS My Drive icon from showing up in the chimera menu.
One thing I did learn was that sometimes this may not work as diskutil reports the discs differently that the bios has assigned them. So, when you get to the chimera boot screen, don't make a selection. Instead, click TAB. This will bring you to a screen where all the menu items are listed and their corresponding associations.
Hope this helps you!!