I don't see any available options for right angle from the drop down, is this the sketch tools (editor tool bar with the pencil icon)? One of the sketch tools in the drop down menu is Right Angle. It will only allow you to create lines at a right angle. HOWEVER to make it work for your preexisting lines you will need to start at a vertex that is NOT the one at which you wish to make the right angle. Here is a simple procedure. go to the line you need to make the lateral. I will call it pipeline have your snapping set to line and vertex (or whatever your GPS point is) start off a little away from the lateral point and start your lateral. for the second vertex in the lateral click on your gps point. then go off in whatever direction you want. when you are done with the lateral you will need to delete the first vertice. A second way is if you know the exact angle of the original pipeline you can use the COGO drawing tool to specify exact angles. Once you have your first lateral off the pipeline you can then use the cogo tool to accurately and easily draw in the rest of your lateral to where is it going. Very helpful this if you have other elbows that are not 90 degrees. Keep in mind though that your GPS point will probably be off by anywhere from a few inches to many several feet. Depending on the quality of your GPS unit and the method used to capture it.
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