Join Pieces
You can use the Join Pieces option when you want to join more than one piece together in order to create a single piece. You can only select a piece that has nearly the same area. If you try to join pieces with different areas, the Join Piece option will not be enabled.
Icon & Location
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                                            Menu: Piece > Join Pieces 
To use the Join Pieces option:
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                                            Open a Marker file. 
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                                            Using your mouse, select two pieces that have a similar area:  
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                                            From the main menu, go to Piece > Join Pieces.  
 Notice the pieces were joined. The piece name changed, and the number of pieces changed accordingly.