There is absolutely no straight forward way of transferring mb on Airtel network but you can easily do that by following these steps to transfer mb of your choice to your friends and family.
To Transfer 10MB:- Dial *141*712*11*recipient number#
To Transfer 25MB:- Dial *141*712*9*recipient number#
To Transfer 60MB:- Dial *141*712*4*recipient number#
To understand more, Please dial *141*1# and follow the voice prompts to get more info about the bundle transfer.
Note:- 100 will be deducted for every MB Transferred.