These commands work on objects selected with the Transform Tool (arrow) or in Objects Inspector.
The main menu > Transform > Shaping commands allow to modify and combine selected objects with use of the Boolean operations.
Two selected objects. Green object has an opening (hole).
Union - this command creates an object or objects that contain all selected objects merged together. Vertices inside of the filled areas are erased. If selected objects do not overlap one another, result of the union are copies of the original objects.
Union of two objects.
Intersection - this command creates an object or several objects that are intersections of the selected objects. If selected objects do not overlap one another, this function does not produce any new object (as intersection does not exist).
Intersection of two objects.
Difference - this command subtracts selected objects from the object that is first in order of creation among the selected objects. It is necessary to arrange order of respective objects in the object inspector list before use of this function, to assure proper order of objects. Newly created object or objects contain only those areas of the first object that are not covered by the next objects.
Difference of two objects.