If you haven't figured this out by now already, you actually CAN drag select a portion of terrain and copy + paste it and, as s3rius said, the same for doodads / units. If you're having problems with alignment (getting the doodads and units to exactly the right spot with respect to the terrain), then put down a doodad or unit with a snap-to-grid placement, which will force all of the other doodads to align relative to IT and which will in turn be relatively easy to align with respect to the terrain.
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If you haven't figured this out by now already, you actually CAN drag select a portion of terrain and copy + paste it and, as s3rius said, the same for doodads / units. If you're having problems with alignment (getting the doodads and units to exactly the right spot with respect to the terrain), then put down a doodad or unit with a snap-to-grid placement, which will force all of the other doodads to align relative to IT and which will in turn be relatively easy to align with respect to the terrain.