There are 4 available task statuses:
To-Do
In Progress
Completed
Not Applicable (must be enabled)
While you can't add new statuses, you can change the names and colors of these 4 statuses to your liking.
Topics in this article:
Customizing a Task Status
You can change the default name and the color associated to a task status. However, changes you make won't change how the status works. For example, you could rename the Completed task status to To-Do, but the task status will still mark tasks as complete in the system.
Go to Admin > Tasks.
In the menu on the left, click Task Statuses.
In-line with a status, click Edit.
Change the name and/or color, and then click Update.
Enabling the "Not Applicable" Task Status
The Not Applicable status works like the Completed status, telling Sisu that a task no longer needs to be completed. It also makes it clear that the task wasn't completed because it wasn't applicable to the transaction.
Go to Admin > Tasks.
In the menu on the left, click Task Statuses.
In-line with Not Applicable status, click Enable.