Sale in transit

Dear Mr. Sunil... Form C only effect where goods delivered actually.

As per my understanding about your query.

1. Seller "C" sell goods to "A" but delivered to "B" . in this case "B" have to issue form C to seller.

in second case

2. Seller "C" sell goods to "A" but delivered to "B" which is in same state, in this regard no form will be applicable because on the bill VAT should applicable not CST.

Case 1

 As I understood, A and B are the branches of a same Company, so that A can't sell to B in transit. A can make stock Transfer to B under Form F Condition. A Should issue C  Form to C and B Should issue Form F to A.

if A and B are not a branches of same company and different entity, A Should issue C Form to C and 
C should issue E1 Form to A. B should issue C Form to A  also.

CASE 2

Case 2 is not an interstate Sales becuase the stock not physically moving from one state to another, he should charge VAT.