sql server use computed column

Question

I have a query like this:

select 
(price1 + price2 + price3) as total_price 
from prices

How can i use the computed column total_price to c

Answer 1

select T.total_price,
       P.price4 + T.total_price as total_price2
from prices as P
  cross apply (select P.price1 + P.price2 + P.price3) as T(total_price)