If I have a shapefile layer in QGIS showing the spatial boundaries of subsections of a larger area (e.g. counties within a state, or countries within a continent), how would I selectively crop out one section of that shapefile and export it as its own shapefile (e.g. only Germany if I have all of Europe)? I don't want to crop by drawing a custom polygon around borders myself, as it needs to be exact for each subsection. Can this be done with attributes somehow?