View rules specify how view frames display in the drawing document. You can use delivered view rules or create and modify your own rules that enable you to incorporate custom symbols and labels into your drawings.
The view rules are saved in the [Reference Data Folder]\SharedContent\Drawings\Catalog\Rules\ViewRules folder. For more information, you can open the rule XML file to view the comments in the code.
For more information on including detail and section views in your drawings, see Place a Section View or Place a Detail View in the Orthographic Drawings User's Guide.