A 'spending miles' question

My wife and I are both members of the Exec Club.
We have been collecting miles for years and never realy tried to spend them.
However I have more miles than my wife.
Now the question.
I have more than enough for a single ticket UC from LHR to EWR, BUT my wife is somewhat short of enough.
However if we could add our miles together then we do have enough for two such tickets - so the question is can we in some way add our miles togther for a combined booking.
Mnay thanks for any ideas or other aspects to the problem
Fairphil
We have been collecting miles for years and never realy tried to spend them.
However I have more miles than my wife.
Now the question.
I have more than enough for a single ticket UC from LHR to EWR, BUT my wife is somewhat short of enough.
However if we could add our miles together then we do have enough for two such tickets - so the question is can we in some way add our miles togther for a combined booking.
Mnay thanks for any ideas or other aspects to the problem
Fairphil