Is it possible to correct locations...

After installing a few free and payware scenery and object files, I've run into a problem for which I am seeking a solution.An example of the problem (which is not limited to the San Diego location), I've installed all of the FS meshes, UT-USA, and a couple of San Diego scenery/object files.The result is more than satisfactory overall, HOWVER, a couple of the ships are now located inland! Obviously this is undesirable.Is there a way to, I guess, "open" someone else's bgl's(?) to change the locations of these items?I'd hate to have to get rid of the offending/misplaced items by the radical method of removing the entire scenery/object set when 90% of it works. Thanks in advance for your replies.