If you're going to install a stovetop in its place (i.e. just the burners for pots and pans), you presumably can use the same propane connection and not have to cap it off. Do be careful not to mutilate the flared end of the propane line in that case so it will seal properly.
On my stove, at least, the connection to the propane is under the top lid, which opens up kid of like a car hood. My apologies if you already knew that. Once disconnected from the gas supply (which, of course, should be turned off at the tank!), it should be pretty straightforward to unscrew and pull out the range.