how to pass form input values to other page and also its page id using session in php

i want to pass the input form values to other page and echo in form...and also its page id using sessons

here is the code

form.php?bid=3

form1 :

from 2: final submit

I want pass the total_cost value from 1 page to send page and echo in second form and also page id pls help some one using php and session i need guys pls help new to php