I have cash ISA with Nationwide from my last year cash ISA subscription. I would like to start trading with S&S Trading 212 S&S. Certainly I do not want to transfer this cash ISA all together in one go. I would like to transfer it to Trading 212 cash ISA and gradually converting this cash ISA bit by bit to S&S ISA by investing/trading it using Trading 212 platform.
Could I do that. What is the correct process I need to do to ensure that it does not lose the ISA privilege?