When you insert new devices into the schematic then you can define that these devices are not to be automatically numbered. Devices that are excluded from the numbering are allocated an identifier and a counter. The counter is not incremented.

Precondition:

You have opened a project.

1. Options > Settings > Projects > "Project name" > Devices > Numbering (online)
2. Click [...] next to the Numbering format field in the Settings: Numbering (online) dialog.
3. Select a user defined scheme from the Schemes field.
4. Select the DT tab.
5. Deselect the check box for each device group that is not to be numbered online.
6. Click (Save) and then click [OK].

See also

Specifying Online Numbering Format

Automatically Numbering New Devices

Setting Prefixes in Displayed DT

Inserting Devices in Macros / Copies with Unchanged DT