Howto work with large projects with many similar groups of tasks? Best practice

Hi,

this is the scenario:

TV-Production with 50 Episodes. Let's say every Episode contains:

• Episode 1
  • Preproduction (5d)
  • Production (8d)
  • Postproduction (10d?)
  • Delivery (milestone) (0d)
• Episode 2
• Preproduction (5d)
• Production (8d)
• Postproduction (10d?)
• Delivery (milestone) (0d)

a.s.o.a.s.f

At the time of the project start we do not know how much time the Postproduction will take on average. So we assume 10days.

Questions:

1. Every Episode has the same set of subtasks. How can I distinguish the tasks in teamplanner? Do I have to rename every subtask to make the name unique? (In most of the other Tables and views I can use the column "summarytask name")
2. What if I want to change the duration of every "Postproduction" subtask because I notice that it takes 15 days on average? How would I do this (filter the tasks and drag'n'fill new durations or would you work with pasted links (paste special) in this cells? The latter seems a bit buggy to me in MS Project 2016. If I copy an Episode which contains pasted links it seems to be unreliable, some work some don't)
3. How would you (the pros) prepare such a project.
4. Is it best practice to place the "Delivery" Milestones on the same hierarchical level as the Episodes? 

I hope someone can push me in the right direction. 

Many thanks in advance

Björn