Asset Data migration with Accumulated depreciation

Hi Team,

We are planning a data migration for Fixed Assets related data from Jan 2013 till Mar 2018. Each Month wise asset cost, depreciation and accumulated depreciation values for various assets are maintained in a spreadsheet. All the values for depreciation and accumulated depreciation are calculated in an excel sheet and then these are posted in Oracle General Ledger manually to the relevant account code combinations. The requirement is to transfer month wise cost,depreciation and accumulated depreciation in Fixed Assets for the Corporate book as well as the Tax book. They do not want the system to calculate the depreciation amounts