Changing Quote fields/Layout/formula's

Changing Quote fields/Layout/formula's

I am new to Zoho Enterprise version. I am changing parts of the layout of Quote.(Invoice)
I removed and add some fields etc etc. .....working good.

  • I am looking for the (Sum) formula of  "Grandtotal" ..  cannot find that,...where is that accessible/changeable.

  • Also: I have listprice in Product, say 1000 but  I need to add (with a formula? ) the freight per Unit (metric ton)

Thanks for reply.
William