@Denise1789 Your problem stems from the fact you are doing it totally wrong (soz).
You need two listings
< Listing A - 1 bedroom place
Listing B - 2 bedroom place
Then link calendar a and B together to avoid double bookings.
If it works well you can consider blocking Listing 1 in high season to 'force' the 2 bed place to be booked. Blocking doesn't link across the calendars so if you have a private booking or want a holiday you need to block listings A and B