New devices / functions which you insert by means of the insert center into the schematic pages or create in a navigator without placement, can be numbered automatically on insertion or creation. A DT is determined and automatically assigned online for every new device / function, depending on the online numbering format selected. If the online numbering format contains a counter, the DT's counter is incremented.
                                                    
Note:
Only the device groups that you have selected in the online numbering format are numbered.
Preconditions:
- You have opened a project.
 - You have opened a schematic page.
 
- Select the following commands: File > Settings > Projects > "Project name" > Devices > Numbering (online).
 - Under On symbol insertion, select the Number option.
 - If you want to create or edit an online numbering format, click [...] next to the Numbering format field.
 The Numbering formats dialog opens. Here you can define an Online numbering format. Click [OK]. - If you want to use an existing online numbering format, select an online numbering format from the Numbering format drop-down list under On symbol insertion.
 - Click [OK].
 
Insert and number a device / function via a symbol
- Select the following commands: Insert center > Breadcrumb trail Home > Symbols. Using the folder structure navigate to the desired symbol and select it by clicking the preview tile.
 The symbol hangs on the cursor. - Move the cursor to the desired location on the schematic page.
 - Click the page to place the symbol.
 The Properties (components): <...> dialog opens.
 The Displayed DT field proposes the displayed device tag for the new device / function according to the online numbering format. - Click [OK].
 The symbol is placed and the DT is displayed in the schematic. 
Create and number a device / function without placement
- Select the following commands: Tab Devices > Command group Devices > Navigator.
 - Select the Tree tab.
 - Select the project level or a structure identifier.
 - Select the New popup menu item.
 - Select a function definition in the Selection field of the Function definitions dialog and click [OK].
 The Properties (components): <...> dialog opens.
 If you have previously selected a project level, the Displayed DT field suggests the displayed device tag for the new device / function without a structure identifier, depending on the online numbering format selected.
 If you have previously selected a structure identifier, the Displayed DT field proposes the displayed device tag for the new device / function with a structure identifier, according to the online numbering format selected. - Click [OK].
 The device / function is created in the device navigator. 
See also
Specifying Online Numbering Format
Setting Preceding Signs in Displayed DT