Normally I would let the pcb-shop combine the boards, since they have the right tools and do a very good job. If you want to do it yourself, you get into trouble if the two schematics have equal ref-des or netnames. If you got that right - i.e. data for both jobs are in the same schematic - you just expand the boardoutline to cover both pcbs. The boards outlines must be drawn so that they have to have a small tab that connects them and makes them the same board, but you can easily cut this away after production or use it to keep the boards together during mounting and testing.
Thank You, Per.
I just split and extend the boardoutline of big board to form the outline of small boards. Is it same as your method?
Further consideration, if I just draw the 2D-line instead of board outline for these boards and reveal the 2D-lines as outline in gerber files. Could the gerber files be used to manufacture corresponding boards?
That is exactly what I suggest. If you draw the additional boardoutlines as 2D-lines, clearence-check gives you all kinds of problems.
Thank you, Per