I am looking to trim all polylines outside of a polygon, so that when data is requested, I can send only data in that requested area. I tried selecting by location, but the issue is that there are many polylines, some which fall completely within, some that fall completely outside, and some that cross the boarder of a polygon. I need everything to bee trimmed so that the polylines do not go beyond the polygon boundaries. It would be even better if I could specify a buffer distance from that polygon. Does anyone know how to do this?