You can organise your references into groups in whatever way is most convenient for you: by subject area, unit code, project etc.

1. To create a new group, either click on Groups > Create Group from the top toolbar, or right-click on 'My Groups' in the left-hand sidebar and select Create Group
   
   
   
    
2. Give your group a name and press Enter
3. Drag-and-drop references  from the main list on to the group name to add them to the group. (or Right Click .. Add to Group)
4. NB a reference can be added to multiple groups

Smart Groups will collect together all the references in your library that match the set of criteria you provide. For example, you could create a smart group on themes or topics 

• Example:  References that contain a particular keyword will automatically go into a group