On the site: https://medium.com/wolfram-events/multiparadigm-data-science-5-things-you-need-to-know-14ab75a15210 John McLoone explains the ML framework. In part 7 of the lecture at 3:25 minutes he shows that you can add data in a already trained network. https://youtu.be/JRW-BICsUG4?list=PLxn-kpJHbPx12mbdcVVWCelvcIL_R0X
Thanks I Van Veen, I just tried using the same approach of John's. It works well with a much shorter time in retraining. Wonderful!