Pull in a specific version of a file

I'd like to know if there is a better way to do this:
  * File X exists in two branches AA, BB, originally at same revision
  * File is changed in AA, perhaps multiple times
So, now X is in AA@rev_N and BB@rev_M

I'd like to just replace BB with rev_N. Currently, the only way I
can see to do this is to merge the changes from revM..RevN into X
and the commit.

Is there a way to just "adopt" rev_N into branch AA?

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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