Problem:
You wish to use AutoCAD blocks in Inventor IDW files. You are unable to insert a block, or create a symbol that contains dimensional data. Inventor does not support symbols with dimensions.

Options Available ( versions 9 through 2009 tested):

• Use Insert > Object to insert a dwg containing block information. Use the Create From File option.
• This will create a view in the IDW which may be edited by RMB-Edit.
• The dwg will open in AutoCAD, because it behaves like an AutoCAD Xref.
• Have AutoCAD open before insertion, and the process is nearly instant.
• In Inventor 2008, create the 2D file as an Inventor DWG.
• Then open in AutoCAD and add the blocks as normal. When the file is opened in Inventor, the blocks are listed.