Cst query

Dear Sir\madam, I have distribution firm and sale Goods within STATE with 14.5% vat. Suppose, Item01 Rs.100 Vat @ 14.5% 14.5 ____ Price Rs.114.50 If i want to sale goods outside State against C Form,then i have to charge CST. sO CAN YOU HELP ME HOW TO DO SALE INVOICE when i Sale goods outside?