Microsoft Planner custom columns that include formula for calculations. For example, in Microsoft Lists, you can perform a SUM of other columns in the item. ie =SUM([Column1],[Column2],[Column3]) . Ideally, implement the full capability of Microsoft Lists calculated columns in Microsoft Planner custom columns. Specifically not Microsoft Project, but Microsoft Planner. Even if it is a Premium Plan feature (which are backed by Project) the Planner interface should support the creation of calculated custom columns. An example of the capability is here: https://support.microsoft.com/en-au/office/examples-of-common-formulas-in-lists-d81f5f21-2b4e-45ce-b170-bf7ebf6988b3