Hi,
Currently, when mirroring a Timeline column, it is not possible to access the start/end dates within a Formula column.
This creates a major limitation when working with Portfolio boards, where project timelines are mirrored from connected boards and calculations are required.
Example use case:
Portfolio board with a Mirror column (Timeline from project boards)
A Date column in the portfolio
Need to calculate the difference between the portfolio date and the Timeline end date
Today, this is not possible because the mirrored Timeline does not expose its underlying date values.
Suggested solution:
Allow Formula columns to reference the start and end dates of a mirrored Timeline, or provide a way to extract these values into usable fields.
This would significantly improve reporting, tracking delays, and cross-board calculations.