How and where do i use the nocollide this only--in model properties or table file(please answer tables).
Nope, in model properties

Open the model in PCS2, look at the list on your left - under "Subobjects", select something named like "detail0" or "hulla". It should be the most detailed version of the ship, which you see by default. With that selected, look at the white box to your right, and type $nocollide_this_only in it. Repeat for every subobject (turrets and stuff) that you do not want to collide with. Save and close.
BUT, like Starwolf1991 recently discovered, this may not work as expected. Using $nocollide_this_only on the main hull may affect the shields as well. This is probably a bug in the engine which you'll have to work around, or wait till it gets fixed.