Create your own image transfer learning data?

Hi.
I have, but what I’m trying to sort through is I have saved and exported my model.
I found this thread and wanted to do something similar:

I’ve trained my model on my images (call it imageSet1) and trained on the new image set (imageSet2) using a similar basic setup.

What I think I’m missing is how can I take my trained imageSet1 and how do I transfer learn that and build it out with resnet etc. to get transfer learning from both. Again, maybe I’m missing something obvious.

I have saved and exported both, I’m just missing the connection.