Using Groups
Tasks can belong to multiple groups. Groups work like folders or tags.
Add a task to one or more groups when creating or editing it
Use the All / Group Filter to view tasks by group
Tasks in a group also appear in the "All" view
On the premium plan you can also create private groups for tasks that are only viewable by the members of the group.
Great for keeping track of projects like:
#Launch-Q3
#Design
#Client