Combining Objects and Constructing Shapes
Combined drawing objects act as grouped objects, except that you cannot enter the group to edit the individual objects.
You can only combine 2D objects.
To combine 2D objects:

Select two or more 2D objects.

Choose \<emph\>Modify  Combine\</emph\>.
Unlike groups, a combined object takes on the properties of the lowermost object in the stacking order. You can split apart combined objects, but the original object properties are lost.
When you combine objects, holes appear where the objects overlap.
In the illustration, the uncombined objects are on the left and the combined objects on the right.
Constructing Shapes
You can construct shapes by applying the Shapes  Merge, Subtract and Intersect commands to two or more drawing objects.
Shape commands only work on 2D objects.
Constructed shapes take on the properties of the lowermost object in the stacking order.
To construct a shape:

Select two or more 2D objects.

Choose \<emph\>Modify  Shapes\</emph\> and one of the following:

\<emph\>Merge\</emph\>

\<emph\>Subtract\</emph\>

\<emph\>Intersect\</emph\>.
Shape Commands
In the following illustrations, the original objects are on the left and the modified shapes on the right.
Shapes  Merge
Adds the area of the selected objects to the area of the lowermost object in the stacking order.
Shapes  Subtract
Subtracts the area of the selected objects from the area of the lowermost object in the stacking order.
Shapes  Intersect
The overlapping area of the selected objects creates the new shape.
The area outside the overlap is removed.