I used the AI itself to enter this discussion into ChatGPT and asked it to generate a prompt that would address this and our concerns. I worked it until it provided this suggestion below, which I haven’t tried yet, but you might want to give it a go.
“This topic has led to a related but distinct discussion. A new subtopic has come up—can you help me create a concise summary of the key points we’ve covered so far, including any foundational facts and background details? I’d like to move that summary into a new chat so we can explore this subtopic separately while continuing the original discussion here. Could you also flag any other significant ideas that might arise in our main conversation, so we can ‘fork’ those if needed? This way, we can keep both chats focused and maintain important context across them.”