The Insert tab lets you work with references, multi-view blocks, blocks, attributes, and content from external sources like Content Browser and Autodesk Seek. 
-  Reference. Contains commands for working with external references (xrefs), DWF/DWFx files, DGN underlays, and raster images. 
 
-  Block. Contains commands for inserting and editing blocks and multi-view blocks. 
 
-  Attributes. Contains commands for creating and editing attributes. 
 
-  Import. Contains commands for importing WMF, ACIS, 3D Studio Max, DGN, and LandXML files. 
 
-  Content. Contains commands for inserting content from Content Browser, from DesignCenter, or from Autodesk Inventor into your drawing. 
 
-  Seek. Lets you search online for prefabricated design content.