I am using Instant Scenery 2, and I can move/delete objects from other bgls. I have the "PAUN" Unalakleet airport addon. In the pictures, I moved the airport's windsock, (the red box in front of the plane.) You'll need to learn your way around the IS2 program, but it does move objects, as I said. (disclaimer- I don't promise it'll move those buildings out of the water.) I have some buildings in the water at PAUN too, thanks to UTX Alaska. I can't move those. But since your buildings are not UTX, It should work for you.
I think Spud is right, in that Instant Scenery (1) can't do it, but IS "2" can.
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