Pick Reference
Use this tool to pick or unpick entities that are part of a reference file. Reference objects cannot be selected in the viewport using any other Pick tool such Pick Object.
You can specify which entities of the reference to pick, including objects, alternatives, groups or layers, as well as the reference file itself (all entities).
Access this tool from the Pick palette:
Pick Reference Options
Pick Level
Specifies the type of entity you want to pick in the reference file. Choose between: Component, Layer, Object, File, or Alternative. By default, Pick Level is set to Component.
Note: When set to Object, the tool picks the root node of a reference group.
Curves/Surfaces/Shells/Meshes
If the Pick Level is Component, you can further refine the type of objects to pick. By default, all available options are selected.