This question already has an answer here:
When I purchase flight ticket in same agency and with Emirates/code share (for example JFK-DXB-PVG) and clear customs & immigration during the layover, can I drop off extra luggage in Dubai to final destination (DXB- PVG), if:
- I have not dropped off luggage before?
- My free luggage allowance (Number & Weight) has not used up?
- I have already used all free luggage allowance and wish to purchase extra luggage allowance in layover cities counter?
PS: Please not that a possible duplicate of Checking In Luggage During Intermediate Leg is talking about United, not Emirates.