I have a traditional project structure
A project has one or more Phases has one or more Tasks, each of these has a reference to the parent and each has a start and end date.
Project Name, Project Start, Project End Phase Name, Phase.Project, Phase Start, Phase End Task Name, Task.Phase, Task Start Task End
Rather than maintain multiple different date fields I’d rather use roll ups of start and end dates for the lower level record
Deliverable 1 has a start date of the earliest date of Tasks 1, 2 & 3.
Reading what I can find related to first and last dates I have tried multiple equations but keep coming up with blank rows. Could someone point me to an example please?