Within Teamwork, you can archive any cards that you have marked as complete in board view.
You can mark cards as complete by ticking the checkmark to the left of the task title on the card.
Once a task is complete you can choose to archive all completed tasks in the column by clicking the three dots beside the column name and choosing Archive Completed Cards from the dropdown menu.
Once selected, the completed cards will be removed moved from the column to the archive.
You can view the archive by clicking the options button (three dots) in the top right of the Board area and choosing View Archived Cards.
You can view the task details by clicking the magnifying glass icon to the right of the task name.
You can also unarchive cards by clicking the relevant cards in the Archived quick view. When at least one card is highlighted, you will see an Unarchive Card(s) button in the bottom right.
Unarchiving will move the cards back to the column they were previously in.
Note: Archiving cards in board view will not affect any tasks within the List view.
For more information, see: Managing Board View Columns