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SunilKumarSunilKumar 

Regarding related list

Update the New Leads button on Case Related List for Lead. 
This should autopopulate 
The record type as Sales Lead , 
 Contact on Lead should be populated with Account Name from Case 
 Assigned Dealer should be populated with Primary Case Dealer from Case.
VineetKumarVineetKumar
Is this a custom button that you have created?
SunilKumarSunilKumar
Yes
VineetKumarVineetKumar
You will have to perform URL hacking, refer the below post to get an idea:
http://www.salesforceben.com/salesforce-url-hacking-tutorial/