can I connect A bath waste to shower wastepipe?

BECAUSE OF LIMITED SPACE,I INTEND BUYING A "d" SHAPED SHOWER CUBICLE.THE PROBLEM BEING THAT MY BATH WASTEPIPE RUNS ALONG THE WALL THAT I WOULD HAVE TO USE FOR THE SHOWER.CAN I CUT THE SHOWER BASE TO ALLOW THE BATH WASTE THROUGH IT AND THEN T INTO THE SAME PIPE FROM THE SHOWER OR VICE VERSA.CANNOT GO UNDER THE FLOOR OR THROUGH ANY OTHER WALLS,ANY IDEAS WOULD BE GREATLY APPRECIATED,THANKS.