How to join new cornice of a WIR to existing cornice

Hi All,
I am about to start on my next project which is to install a Built In Robe in a bed room.(I have already checked out a few good links for this.)
MY QUESTIONS IS:
When there is existing cornice in a room and you are creating a new wall (or end of built in robe as is the case) the new wall comes off the existing at right angles. How do you dress the new wall with cornice and have it meet and match with the existing cornice? I know that normally when to cornice meet that they are mitred however as the existing is already firmly attached to the wall this may be difficult.


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