There's a bus line from Bodø to Narvik. Generally, there are two connections per day. Check the planner here (fare is also given) or the PDF timetable here (expand "Regionruter”).

Is bus from bodoe to narvik covered in Eurorail rail pass ?

This bus is not included, as you can see here.

No the bus is not covered :/

Here a Trip report from the Bus https://rail.cc/blog/bodo-fauske-narvik-bus

Note/hint: this bus passes first Fauske (about 50-55 mins after Bodoe) where it connects direct with the also 2/day trains from Trondheim. Bodoe is not really worth visiting.

I think this busline offers 50% discount to passholders (not 100% sure). Fares or in fact about everything  in NO are in general quite high for even west-euroś. ALL transpo anywhere in NO is on its natioanl transitplanner entur.no (most countries in west EUR have such a thing).

@mcadv  Couldn´t find the discount for that bus anymore :/

Correct, it seems to have disappeared some years ago.