Timelines - multiple work streams


We need to collect, and summarise timeline info in several streams

a) Activities by group, relating to their workstreams (seasonal busyness)

b) Org wide activities (i.e.long term and annual plan etc),

c) External factors relating to staff availability (school holidays etc)

This is to aid in selecting best timeline to schedule projects so as not to conflict with he above

Has anyone managed to set something up that may help this? (New SS user, do not have RM)