Creating New Capital cost allowance tax book for existing Corporate Book

Already Corporate book in use for the past 02 years for Canada region (no tax book is created as of now )

Now customer want to create Capital Cost Allowance Tax for existing Canada corporates book

what is the process, while creating Group Assets which Date placed in service we should take current period or past periods

Group Depreciation should only calculate in Tax book, not in Corporate Book, what is accounting Impact , etc best approach to go head, please help us out, Thanks in advance