Whats the best way to..... in FSX

Hey guysI designed some bush scenery in fs2002 and 2004 using ground2k and airport.. i believe. I would like to do this again. My goals are to use the underlying mesh scenery as a base for the grass runways so its not completely flat. I had great success with my last design.First question is what program should I use to remove the current airports/objects within the area im working. Its about a 3 x 3 mile area and in FSX and previous versions, they have 4 airports in this little space when in reality there are only two. 2. Once removing all the airports, will the mesh be correct or will those areas still be flat?3. Can I still use ground2k with FSX to change the forest areas to grassy areas and such as I did before?ThanksIf your interested in what im talking about, the airport is Smisson Field (7GA9)