the phase view presentation and wizard not usual

Generaly, in "btp" management software, the view and process for phase is different

The better should be getting total amount on the phase line instead the sub-total but i think the client do not allow it easier.

PHASE 1
   > Phase 1.1 (children)
            product "123"
            ouvrage "abc"
              > subline added product "987"
         > sub-total (phase 1.1)
   > Phase 1.2 (children)
            product "541"
            ouvrage "ghf"
         > sub-total (phase 1.2)
> sub-total (PHASE 1)
PHASE 2...

Maybe the wizard shouldn't leave the user input the price and amount. If the user can modify this information, then the childrens must be actualized.