Creating a Pricelist based Pricelist

Hi ,

I want to create a price list based on a price list.

Lets say I have a price list " Net Prices" which will have price list lines for all the items with their respective prices.

Now I have a simple formula for deriving my warranty prices which is ( Net Price of the item*0.7).

I am thinking of creating a formula based price which will have a single line for All Items with the formula calculating the item price.

Can you please let me know what setups I need to do to attain the above.

Thanks for your help.