This is exactly how I use it. Just like with conversations, ChatGPT tends to lose the plot after a while. It starts to “forget” the start of the conversation, and has trouble parsing things. It’s great for the first few paragraphs then begins to drift. So only use it for a few “paragraphs” worth of code at a time.

And as always, you need to make sure that it’s not just pretending to know. It will confidently feed you incorrect information, so you need to double check it occasionally.