https://web.csulb.edu/depts/enrollment/graduation/bachelors/timely_grad_ugrad.html#timelyunits
Only 70 units transferred from community colleges will count toward the 120 units for graduate, but you will get subject credit for all courses taken.
In terms of GPA, colleges usually calculate it only on courses taken at that college. If you are not sure about CSULB, ask directly.