This post function will calculate field value based on the formula configured to all related issues.
A user defines which issue should be the destination issue.
Choose the Field on which calculated value has to be set and In the Formula bar, set the formula. Make sure the formula is correct. You can use other fields, numbers and mathematical expressions to calculate the formula. In this example, Total Profit will be calculated as half of the Business value.
See the Use Case Calculated Field for a nice example, how several of our customers use it.