Your downloads are saved into folders according to the tags you’ve assigned. You can set another path for a specific tag folder. It means that all downloads with this tag will be stored in the folder specified by you, not in the default one.
To set the path for a tag folder go to "Tabs" tab in Preferences. Type the tag’s name in "Tag" text field (or choose the tag from the list to the left) and set the path in "Folder" field.