Stay in the same chat. The assistant remembers the earlier questions and answers, so you don't need to repeat the facts. Ask one thing at a time.
Ways to refine
Narrow it down: Focus on the withholding tax consequences only.
Add a fact you left out: The lender is a UK company.
Ask for another format: Put this in a table.
Ask for more depth: Which conditions apply, and where are they in the law?
Correct it if an answer goes in the wrong direction: The borrower isn't tax resident in Ireland.
New topic, new chat
When you change topic, start a new chat, so the earlier context doesn't affect the answer. Your earlier chats stay under Recent chats.