Is it possible to have a stopover of 3 hours on my inbound trip?

My country of residency is Germany.

I want to use to inbound trip to travel from Innsbruck to Berlin. However, I was hoping to stop for a few hours in Munich to meet a friend. Is it possible for me to have a 3 hour stop over on my inbound trip?

Also, I was planning on using my outbound trip later to go from Hamburg to Amsterdam. Is it possible to use inbound/outbound in this order, and to/from different destinations?

Thank you:)