Condition Total

Hi

I have a pricing procedure where in i would like to achieve the following

900 ZAP1

901 ZAP2

902 ZAP3 (900+901)

ZAP1 is a cost price that gets picked up from material, ZAP2 is mark up (say 10% of cost price) which i am keying in manually.

ZAP3 is a gross total (Cost + markup) that i would like to bring automatially.

Need your suggestion.

Thanks

Kalpesh