What if a normal wall/ceiling wraps around a corner and joins to a cathedral
ceiling wall and then goes to an inside corner of that cathedral ceiling
wall?

Cathedral ceiling wall would have top of crown at its pitch and then when
getting to the corner you have join to that pitch with a regular 90 degree
except that your run is the pitch of the ceiling.

Does all that make sense? It's a breakfast nook with regular ceiling
abutting a cathedral ceiling room.
TomNie

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Anyone seen any tools to help cope crown? Rockler has a plastic