There is a way. Back up your work files first!
CadSoft Download/user programs: "duplicating_v45.zip" Get this.
After unziping you should have duplicate.scr, duplicated_board.scr, duplicated_sch.scr. These are "programs".
You also will get "parts" to place on the board and sch.
You will have a part "bottom-Left", "Top-Right". These parts need to be placed to make a box around the sch area you want duplicated. On the board you will also place these parts. Then there is a part (can't remember the name) that directs where to copy the block to.
There is a way to say howmany copies, don't remember how.
At this point you type duplicate.scr into the text window and see what happens.
It may take several trys to get it working. Please write down how to use this function and report back!