Yes, you can share prepaid extra baggage allowance (by piece) with travel companions under the same booking if you check in together for the same flight(s) at the airport.
However, the total weight and total size of each individual checked baggage must not exceed the per-piece limits specified for your ticket fare class. For full details on your baggage allowance, please refer to your e-ticket, log in to Manage Booking or visit our Baggage Information page.