Please have a look in your printer help file and look for topics on printing a "poster" or "tiling".
Every printer that I have owned had the facility to do this some were better than others at it. Xara is not like Illustrator where it is built into the drawing software but it lets the printer software take over. If the drawing has to be very accurately done you may want to increase the number of pages to allow for crop marks and reg. marks so that it can be lined up accurately.
Design is thinking made visual.
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