multi stock data training

for what I understand, it needs 30 stock data to train a model, if there is a lot of stocks(> 30), I want to use all of them to train the model, how can I do that?

for example, firstly I use 30 stock data, then call reset() function, and read next 30 stock data, continue to train model parameters, the key point is that I do not reinit model

is this will work?