=== I originally set my connection as a one-way connection, now I want a two-way connection===
You will need to disconnect your connection with Beds24 in the Booking.com extranet and then initiate the connection with two-way connection.
=== Can I use the same Expedia hotel ID for different properties in Beds24?===
Theoretically yes but we recommend not to do this because Expedia allows only to send one update for a property at a time. If there is an update for both Beds24 properties Expedia will reject the second one which can cause overbookings.