Aside from annotations, assembly detail views contain only those elements that make up the assembly instance. You can add annotations to an assembly view, but you cannot add any model elements, nor can you edit the assembly or its member elements.
You specify the particular views you want and other parameters in the Create Assembly Views dialog, which you can access in either of the following ways:
Assembly panel 
Create Views. In the Create Assembly Views dialog, you select the types of views you want, select the desired scale, and (if Sheet is selected) specify titleblock information. When you click OK, the views are added to the Assemblies category in the Project Browser under the assembly type name.
Assembly views always remain associated with the assembly instance for which they were created. If an edit to an assembly instance causes the instance to change from one assembly type to another, any assembly views belonging to the edited instance will be listed under the project browser node for the new assembly type. If the type you changed to already has assembly views, an error message informs you that one set of views will be deleted.
If you create additional section views within an assembly view, they inherit the assembly view's relationship to the assembly instance.
To place an assembly view on a sheet
After views have been placed on a sheet, you can expand the sheet's node in the Project Browser to see the list of views. Note that default sheet numbers are assigned incrementally without regard to assembly type.
If you want to place the same view on more than one sheet for the same assembly, right-click the view name in the Project Browser, and click Duplicate View. For more information, see Duplicating a Detail View. Note that assembly views cannot be place on normal (non-assembly) sheets.