Keeping parent’s phone number

I signed up to an 18-month TalkTalk broadband contract in August that came with phone number 1 whilst in a rented flat. Due to unforeseen circumstances, I’ve had to leave the flat and move back in with my parents who already have BT broadband with phone number 2. I want to bring my TalkTalk contract with me to my parent’s house but not phone number 1. I want the TalkTalk account to have phone number 2 that is already at my parent’s house. Is that possible without permanently paying for 2 separate lines?

Thanks