KKA3 planned cost

Hi,

Can anyone please privide some inputs on below am posting this after searing almost all the links

1. how the Planned cost will be updated in KKA3 in Sales order costing.

2. we are in ETO scenario if we calculate wip using KKA3 can we calculate variances in Production order if so can you explain me th process.

3. we are using the projects also and trying to sellt the project cost to sales order in this case the project cost is shown in actual cost of KKA3 but how this willl be included int he Planned cost.

Thanks,