Task Dependencies allow for building relations between cards, to visually connect work items that need doing in bunches. This way, complex work gets broken down into items of a more manageable size, giving you a clear picture of how far along a big job has come.
It’s a great way not only to bring order to large tasks, but to also show parent-child card relations, and to delegate pieces of work to other team members or boards.
Task Dependencies Power-Up needs enabling in board Settings - Power-Ups.
Once active, there will be an + add dependencies link in an open task’s header:
With it, you can either create a new, dependent task or link an existing card and make it dependent.
Any task that you have access to can be made dependent on another - you can build dependencies between tasks across all columns, swimlanes, and boards. Use the location selectors shown in connected tasks to choose or change a linked task’s location:
Dependent tasks can be opened directly from the master task view and will be shown over it. Cascading structures of dependent tasks can be created and viewed in this way, letting you dive into the core of work, without having to navigate through columns and boards in search of related tasks.
Use the left-right arrows and the return symbol to navigate between dependent tasks - the arrows move through cards on the same level, and the return arrow takes you one level higher in the structure.
The tree-like scheme of dependent tasks shows additional information about cards status - you may come across backlog, in progress, waiting and done icons. They relate to what lane type column that task is in, thereby hinting on their completion stage.
If present, team member assignments and any tracked time records will also be displayed in the tree-like list. You can also reorder the dependent tasks with the vertical double arrow icon, shown when hovering over a listed item.