You create a detail view in a drawing to show a portion of a view, usually at an enlarged scale. This detail may be of an orthographic view, a non-planar (isometric) view, a section view, a crop view, an exploded assembly view, or another detail view.
Detail views expand in the FeatureManager design tree so that all components and features are available.
To create a detail view:
Click Detail
View 
on the Drawing toolbar, or click Insert,
Drawing View, Detail.
The Detail View PropertyManager appears
and the Circle 
tool
is active.
Sketch a circle.
To create a profile other than a circle,
sketch the profile before clicking the Detail
View tool. Using a sketch entity tool, create a closed profile
around the area to be detailed. You can add dimensions or relations to
the sketch entities to position the profile precisely relative to the
model.
If you plan to create a Broken View,
you are advised to relate the sketch to the model.
As you move the pointer, a preview of the view is displayed if you selected Show contents while dragging view.
When the view is where you want it to be, click to place the view. You can edit the view labels and font styles, and you can modify the view as necessary. To remove any sketches that are imported to the drawing, delete them in the FeatureManager design tree.