Symbology provides graphical clarity to a drawing by differentiating among various items by their appearance. Symbology refers to the color, line width, shape, and style associated with items.
You can use line widths, styles, shapes, and color to differentiate among the different types of drawing items, such as cables, power distribution boards (PDB), equipment, and so forth. For example, you can define symbology that differentiates between associated graphical elements and the unassociated ones (auxiliary graphics and symbols) in composite drawings and conventional CBDs. Also, you can, for example, define a power cable that connects to a PDB as being a black, 2-mm thick continuous line, where as a control cable could be a blue, 1-mm thick, broken line.
Along with the default symbols supplied with the software, you can create your own symbols that can be associated with a document and item type. You create symbols in the Catalog Manager.See Creating Symbols in the Catalog Manager help.
The settings in this window apply to both conventional and composite drawings.
Item Type
Allows you to select the item type that you want to define the symbology parameters for.
Drawing Type
Allows you to select the type of drawing where the symbol will be used.
Item Type Filter
Select in an empty cell to open the Select Filter dialog. The Select Filter dialog allows you to select a filter that will narrow down the selected item type to the specific item type properties with which the symbol will be used. You can select, modify, or create a new filter in the Select Filter Dialog Box.
Drawing Type Filter
Select in an empty cell to open the Select Filter dialog. The Select Filter dialog allows you to select a filter that will narrow down the selected drawing type to a specific drawing type where the symbol will be used. You can select, modify, or create a new filter in the Select Filter Dialog Box.
Symbol File
Select Browse 
to open the symbol folder and select the required symbol.
Initial Style
Displays a list of available style names. The style sets the color, weight, and pattern of the symbol as defined in the Catalog Manager.See the Using the Smart Line Style Editor topic in the Catalog Manager Help.
Color
Displays the color associated with the chosen style. Selecting on the color opens a list where you can change the style color. Changing the color does not affect the default settings for the chosen symbol, it only affects the symbol for the item type and document type selected.
Width
Displays the line width associated with the chosen style. Selecting on the line width opens a list where you can change the line width. Changing the line width does not affect the default settings for the chosen symbol, it only affects the symbol for the item type and document type selected.
Pattern
Displays the line pattern associated with the chosen style. Selecting on the line pattern opens a list where you can change the line pattern. Changing the line pattern does not affect the default settings for the chosen symbol, it only affects the symbol for the item type and document type selected.
Move Up
Moves the selected row one row higher, making the priority of the selected item type higher (the top row has the highest priority). The priority rules are set by the filter. The priority determines which rule applies first when rules conflict with each other. For example, Filter A is the first row. The filter's rules state to use a red broken line to represent cables that are between 2 to 10 cm in diameter. Filter B is below Filter A in the Define Item Type Symbology window and its rules state to use a blue continuous line when the cable is between 8 to 20 cm in diameter. If a cable is 9 cm in diameter the software assigns the cable the symbol that has the higher priority, in this case a red broken line.
Move Down
Moves the selected row one row lower, making the priority of the selected item type lower.