[Mikendebbie]

I have never tried to remove the table top - but in one of the Montana factory tour videos...
Pic 1 - the black table top frame has been installed and the guy in the white shirt brings the table top thru the door.
Pic 2 - he sets the table top onto the frame and installs screws from underneath the table top unit on front side of the unit...
Pic 3 - he scoots around to the other side and installs screws from below the table top.

So...look underneath for some screw heads and take those out.