Hello Sandy,
Unfortunately there is no single click way to do this in Xara. However you can use guidelines and magic snapping to make it easier to do this. Turn on rulers, make sure snap to guides is checked in the window menu, and drag a vertical guideline. Draw your line and pull it into a curve, with magic snapping turned on (the magnet icon) you can easily snap your line centered on the guide line, then simply drag the bezier handles to snap them to the guideline, and by adding more guidelines equal distances from the center you can set your curve how you like.
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