Warning: Some symbol libraries such as SPECIAL.slk are blocked and can't be edited by you. When you try to open such a symbol library, a message will appear and the action is canceled. Symbol selection ( Insert > Symbol) only displays those symbols from the stored symbol libraries and symbol libraries are identified by name (without the path) in projects. Store symbol libraries (copy to the project) Symbol libraries are added to the project as soon as they are entered into the project settings, or they are opened or generated in the project. Precondition: You have opened a project. • Options > Settings > Projects > 'Project name' > Management > Symbol libraries • In the Settings: Symbol libraries dialog, click [.] in a column below Symbol libraries.