Printing for transferring to board

So, I want to do my sketches in Photoshop, but then print them out at specific sizes in order to transfer the sketch to my illustration board using transfer paper underneath. A typical size for my illustration board or watercolor paper sheet would be 100cm x 70cm, so this would of course mean the print would have to be divided over several A4 sheets. Now, how exactly do I go about making this happen, and also make sure I get the finished assembled print to be 100x70? I would of course make sure that the sketch is in the correct format and in 300dpi.

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