http://gmailblog.blogspot.com/2010/04/new-in-labs-nested-labels-and-message.html
"Labels are more flexible than folders because a given email can have several labels but can't be in several folders at the same time. A highly requested feature for labels, though, comes from the world of folders: the ability to organize labels hierarchically.

Home
Home/Family
Home/Vacation
You can then create "Home/Family/Kids," "Home/Pets," etc., to get something like the screenshot on the left. If you had the parent label "Home" before you don't have to create it from scratch.
You can create complex hierarchies of labels if that's the way you like to organize your mail, and you can expand/collapse labels to save space. You'll always be able to tell whether a given label contains unread messages in its collapsed child labels by looking at whether it's bold or not."
New in Gmail Labs: Nested Labels has problems
ReplyDeletehttp://bugsaroundme.blogspot.com/2010/04/new-in-gmail-labs-nested-labels.html