A drawing format is a series of lines, tabular notes, and symbols which form a drawing border, title block, revision block, etc. These items contain information about the drawing. Figure 1 shows an example of a drawing format.
Figure 1 An Example of a Drawing Format

There are two basic components that make up a drawing format: border and format block. Splitting the drawing format into these two components simplifies the manipulation of the drawing format.
A drawing border specifies that size of the drawing to be used as well as the geometry placed around the edges of the drawing. Another thing a border does is determine the space available to place drawing blocks, views, and other annotations. A drawing can only contain one border.
A format block organizes drawing information into a single unit. Examples of format blocks are the titleblock and revision block. A drawing can contain many blocks. Each format block can have multiple styles that can be used to determine how the information in the block is shown or not shown on the drawing. Format blocks can also possibly be placed in multiple locations on the drawing.
Here is the basic procedure to add a drawing format and edit a block.
When the drawing format has been added, some format blocks were also possibly added at the same time. These blocks are required for the format and so cannot be deleted.