Change forum to subforum

Is it possible to change (move) an existing forum so it becomes a subforum of another forum?

Eg. I have the following strucutre:

Meetings Group A - 2010
Meetings Group A - 2009
Meetings Group A - 2008
Meetings Group B - 2010
Meetings Group B - 2009
Meetings Group B - 2008

And would like to change the structure to:

Meeting Group A
    Meetings Group A - 2010
    Meetings Group A - 2009
    Meetings Group A - 2008
Meeting Group B
    Meetings Group B - 2010
    Meetings Group B - 2009
    Meetings Group B - 2008