Hi Gopal,
My understanding is that project balances cannot be migrated in ByD. We have been advised to manually key in all existing projects with budgets, sales orders etc. We are not sure what to do with existing project costs and invoices as historical data cannot be migrated either.
Since you suggested migrating the 'Assets under construction' as projects, I wonder if that is a special category? I was planning on using 'Direct Cost Project' process variant as suggested in the ByD help centre for 'Assets Under Construction'
Any further information is appreciated. Thanks