Clip a cutting that is about 4 inches long from the maple tree.
Strip off all the leaves except for a few at the top of the cutting.
Scrape the side of the stem with a knife to "wound" the cutting and improve the chances of a successful rooting.
Dip the cutting in a rooting compound -- available at any gardening store -- and plant it in coarse sand that will not retain water easily, as water will quickly rot the cutting. Space the cuttings an inch or two apart. Keep them in the shade for the first 10 days before moving them into a sunlit area.
Water the cuttings thoroughly as soon as you have planted them.
Water the cuttings lightly and every couple of hours for the first few days by spraying them with water for a few seconds.