By adding a sum field you can show the total of a specific field on linked cards.

For example: show the total number of estimated hours on a project card by displaying the sum of the estimated hours on the linked task cards.

This allows you to quickly get insights by only looking at top-level cards, without having to look at all underlying linked cards.


  • Start by changing the card type, next add a "sum" field.

  • Next you are asked to select the child card you want to consider. The last step is to select the field on the child card you want to sum.

  • Optionally you can set a filter on which child cards should be taken into account when calculating the total.

You can use the filter to create more complex reporting, for example: "Show the total number of hours remaining" by filtering on "Task" cards with status not yet completed.