Nordic Countries - Buying train tickets from Oslo > Bergen

If I want to DIY the Norway in a Nutshell by buying tickets separately on the train website, should I buy one Oslo > Bergen ticket? Or 2 tickets: Oslo > Myrdal AND Voss > Bergen?

I am unsure if the Oslo > Bergen ticket allows me to get off at Myrdal, do the Flam railway, the boat, and the bus, and allow me get back on the train from Voss > Bergen.

I am also currently planning a DIY Norway in a Nutshell. One can purchase either the standard price or minipris. Under the minipris terms, it seems you must take the trains at the times indicated for a reduced price compared to the standard offer. I was planning to buy Oslo->Flam under minipris terms (Voss->Bergen seems to have no minipris offers).

I am also currently planning a DIY Norway in a Nutshell. One can purchase either the standard price or minipris. Under the minipris terms, it seems you must take the trains at the times indicated for a reduced price compared to the standard offer. I was planning to buy Oslo->Flam under minipris terms (Voss->Bergen seems to have no minipris offers).

What I did (a few years ago) was just to buy more than I needed - eg I wanted to go from Bergen to Oslo Aiport, I couldn't get it to price as a Minipris - so booked Bergen to Lillehammer instead, and got off at the airport (using ticketted local train of course). Saved me the cost of a Flytoget - and I find the local trains just as comfortable.

Thanks for the replies. A change of plans, we're just doing Oslo > Bergen and forgoing the travels associated with Norway in a nutshell.