Combining two trained yolo model weights

I’m currently working on image detection models that train on separate (but related) types of data. My problem is every week I got multiple new classes so combining all images and retrain every time it takes lots of time, so I like two train new data separately and after training we combined both weights I’d like to make a combined model weight, to create one model weights.

Hi, did you find the solution to this problem? I have been working on something similar to this your help would be appreciated.