I am using the buffer feature to create landscape patterning which is associated with the contour lines of a particular landscape. I use the buffer tool to reproduce a number of lines after I have meticulously created my line feature which has to run at a certain percentage off-contour. Once this is achieved I replicate this line to see how it behaves when compared to all the other contours. Most of the time I have to make corrections to the original line feature. My question is, is there any function that will automatically update all the lines within the buffer after I correct the original line? At the moment I have to keep reproducing another set of lines using the buffer tool.