You can extend sheet bodies on the selected edge of the sheet Face. It looks like the "Extrude" command but you extend only the edge of the sheet body on the
You can delete solid bodies by pressing the "Delete" button but if more than one body is created by one operation you can not delete a single body without
You can create a sheet body through curves by using the “Through Curves” command. If the curves do not have closed contours, the created body will be a surface