Put this in the Init field using Chair X and it should work a treat
Initialization Man1 Setpos [Getpos Chair Select 0, Getpos Chair Select 1, 0]
To make the man sit on the chair you will have to use an external script or use a trigger using this code:
Man1 switchmove "OnChair"
P.S. @ N00Bs, Make sure you name the Chair 'Chair' and the Man 'Man1' for these particular lines of code.