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To add an aggregate property, click on the Edit aggregates link on the card type where you want the aggregate property to be reported. For example, if you wanted to show the sum of the estimates for all stories in an Epic, you would create the aggregate property at the Epic card level. Mingle will display the Aggregate properties control.

• Enter a name for the new aggregate property

• Select the aggregation type you want to apply (Sum, Average, Minimum, Maximum, Count)

  Aggregate properties ignore values of (not set), so the Average of [1, 3, 6, (not set)] is 3; and the Min of [1, 3, 7, (not set)] is 1;
• Select the scope for the aggregation. You can choose between a specific card type, All descendants or Define condition....
  • A specific card type will apply the aggregation to only descendants of the currently selected level in the tree which are of the specified type
  • All descendants will aggregate the selected property for all descendants regardless of type
  • Define condition... will aggregate the children cards that meet the specified MQL condition. For example, if you want to aggregate stories and bugs but not tasks you can use "Type = Story or Type = Bug and Type != Task" or if you want to aggregate only the Must stories then use a query such as "Type = Story and Priority = Must"

• Select the property which you want to aggregate from the list of available child properties. In the case of Count, no property can be selected.

  The list of available properties is made up of numeric properties that belong to the card type chosen in the scope dropdown. (In the case of all descendants, it is all numeric properties that belong to at least one of the card types falling below the aggregate level)

  For All descendants - if the property is not present in all descendant card types, the aggregation ignores types which do not declare the property.

Click on the Add aggregate property button to create the new aggregate property

Mingle will display the new aggregate property in the list at the bottom of the Aggregate property control.