Label images on-the-fly

I have a code in which it downloads images from Google image according to a query. All those queries are cars (different branch, model and year). Since it is difficult to label each image with a given label (branch_model_year), I would like to first identify the car inside the image and then label it as (branch_model_year).

I've used Yolov3 + Darknet to identify the object within the object. See image.

How can I change this label for a future classification?

Thanks!