Geometry Regions (2D)
Edit 
Geometry (Sketch/Sheet Level)
Use these commands to perform boolean operations on two or
more 2D geometry regions. You can join, cut or intersect two regions and
join the outer boundaries of two or more regions. An Auto close
option will close the resulting geometry automatically. All
dimensions will be removed after using these commands.
Adds two geometry regions into one. The two regions will be trimmed where they intersect. First select the curves on the base region. Then select curves on the region to be added.
Trims one geometry region from another. First select the curves on the base region. Then select curves on the region to be removed.
Trims two geometry regions except where they intersect. First select the curves that define the first region. and then the second.
Join the outer perimeter of two or more geometry regions. Select the curves that define the regions to join.
Auto
close region - Check
this box to automatically close the geometry region.
