be build house bn build town center bt build tower ba build archery range bb build barracks bd build dock bw build wall bc build goverment center by build academy bk build siege shop bm build market bs build storage pit bo build wonder bg build granery
select you units and press control and a number to group your units.
While doing the hotkeys hold down shift and you wont have to reclick the letters again. Just keep on clicking and presto 20 stable in no time. Also Handy for making houses quickly.