Sheet sets were introduced in AutoCAD 2005 and are still a relatively new concept in AutoCAD. They're the digital equivalent of an old drafting concept called a drawing set. A drawing set contains numerous drawings, and often includes references to details, sections, and elevations within the drawing set, along with a drawing or two that contain an index of all drawings in the set.
AutoCAD LT does not support sheet sets.
Sheet sets take advantage of the existing drawings you have been creating over the years. A sheet set contains sheets, which are references to paper space layouts — sorry, you can't use the Model tab as a sheet. If you use the Model tab for plotting and publishing today, you need to switch to the use of paper space layouts to take advantage of sheet sets. A sheet set and all the references to its sheets are stored in a file with the DST extension and are accessed through Sheet Set Manager (see Figure 2-1). By using references to the drawing files, you can use your own directory structures while taking advantage of the benefits of sheet sets. Some of these benefits are
Fast file access: Because a sheet set knows right where a file is located, drawings can be accessed in a short amount of time without the need to browse and open a file.
Consistent drawing creation: Sheet sets can be set up to specify the directory structure and location in which new sheets should be created when they are added to the sheet ...