Warranty & extended warranty for the same item/serial number against the same order:Changing warrant

Hi

I have the following business scenario and was looking for an standard functionality.

(B2B )

1.We provide Extended warranty(free of charge-2 yrs) along with the finished product-which has standard warranty of 1 year .

2.System creates Warranty contract(1) and extended warranty(2) for the same product/serial number against the same order.

In the coverage template for warranty,we have enabled the synchronize install date checkbox

 B2C

After few months,customer buys the product and few months later seeks service.

At this point,we transfer the install base ownership to the customer name and update the Install date(based on warranty registration card).