Hello Divino,
Could you please specify how you would like to classify the data? For the outdoor scenes you mentioned, you can typically use the Classification → Classify by Deep Learning function to automatically classify the point clouds. If you feel that the classification categories are insufficient, you can manually crop the necessary features in the point cloud and use the Classification → Classify by Machine Learning function for further classification.
For detailed instructions, please refer to section 1.5.6.3 of the user manual.
If you need any further assistance, feel free to let me know.
Best regards,