What's the difference between link codes close and closeshape?
Both codes create a link between the first and last points. In the case seen below, the first and last point numbers are 1006 and 1011 respectively.
Close simply connects the last point to the first point.
CloseShape will look at the first two points (and the resulting line) then project a point to create a line that is perpendicular to the first.
For additional information select the following link: https://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/37404/openroads-designer---survey