Great question. The location of this setting has moved several times. As of the date of this writing, you can access it via Account (top left) > Edit Friends. In the left-hand column you'll see a "Lists" section. You should see your "limited profile" here. Click on it, then on "Edit List" above the center column, and finally, search for and click on members you want to add to your "limited profile." Click on the "save changes" button when you're done.

All the constant adjustments Facebook is making to its privacy settings are driving me bonkers. Don't get me wrong - I think more privacy fine tuning options are good, but it seems like every time they make an update it gets harder to find what I'm looking for.

Does anyone know where, currently, the setting is where I can add specific friends to my custom profile lists? For example, I have a "limited profile" list, members of which don't have access to my Wall. How can I add a specific friend or two to this list that's not yet on it?