AutoCAD 2008 User's Guide > Share Data Between Drawings and Applications > Reference Other Drawing Files > Increase Performance with Large Referenced Drawings > Work with Layer and Spatial Indexes > 
Work with Layer and Spatial Indexes
Concept Procedure Quick Reference
 
 
 

To save a drawing with layer and spatial indexes

  1. Click File menu Save As.At the Command prompt, enter saveas.
  2. In the Save Drawing As dialog box, click Tools menu Options.In the Save Drawing As dialog box, at the Command prompt, enter options.

  3. In the Saveas Options dialog box, under Index Type, select Layer, Spatial, or Layer & Spatial. Click OK.
    NoteIf you are saving a partially open drawing that does not already contain layer and spatial indexes, this option is disabled.
  4. Click Save.