What should I do when I want to add new classes to an existing pre-trained model

• Hardware T4
• Network Type Yolo_v4
• TLT Version tao3.0

How can I use this feature?I have trained a model with the old dataset with old classes. And now, I have some new datasets with new classes. What should I change in the spec file or datasets?

Please add the new class into the spec. And also add the new dataset.