Multi level Marketing Software in Asp.net(C#)

Question

Hello Sir,
i am developing a Multi level Marketing Software in Asp.net(C#).
i am unable to get the logic behind it, to implement in my coding. i am stuck there.

please tell me how to design databse in sqlserver.
please Kindly need your help. 
 
Thanks & Regards,
Bvenkat Jeewesh