I would like to be able to cut polygons such as the one below, in QGIS, at a set distance either side of a specified feature on another layer, in this case a footpath line from OS Mastermap.
In this way I would then effectively have a buffer along the lines that could represent a woodland ride network, for example. In this case it is a very simple linear feature, but they are often much more complex, and can be very time-consuming to cut out. Ideally I need to retain the original polygon as this will be used as well.
Is it possible to cut a polygon in this way, or would I have to create the new polygons as buffers along the line and then cut these from the existing polygon?