Accounting of Pre Incorporation expns by subsidiary co.

Can the Preincorporation Expenses be higher than the Post incorporation Expenses?

Promoter company  had been incurring huge operating/Admin/Personnel  expenses for 6 months before incorporation of its subsidiary company . After incorporation of subsidiary raises a Debit Note on Subsidiary .How to treat these expenses in the books of account of subsidiary co.- Whether as pre incorporation expenses and amortise them or as expenses and charge them to P&L