Put OS X dashboard widgets in folders
Organize your widget collection into folders
Here's how you can organize OS X's dashboard widgets by putting them into folders.
1. Launch Dashboard.
2. Click the + button.
3. Your widget collection will appear.
4. Drag and drop a widget onto another widget to create a folder.
5. You can rename the folder to whatever you want.
For more, see the original article at the link below.
Put Dashboard Widgets into Folders | OS X Daily