Hardwood flooring - 3 walls and a sunken living room
I am putting hardwood flooring in a Dining room, sunken living room. The dining room has 3 walls and joins the living room. the joists run the length of the rooms north to south. there is 1 step to the living room.
If I start at the north wall in dining room and when I get to the step I will have to make a cut cutting the groove off how do I join the nosing?
Or should I run the flooring north and south which is wrong ?
Or is there a nosing that comes with a groove side?