Tax book from 2017 for corporate book existing from 2008

We have Corporate Asset book with assets  since 2008. This book does not have a tax book. We maintain excel for tax depreciation calculation (only by category) not by asset. So we depreciation until 2016 by asset category.

We now want to setup a tax book for this corporate asset book.

Should we setup this tax book with same start period of 2008 as in Corporate book and depreciate month after month? This will be tedious as we need to take into account depreciation rules changes during the period as well.

we are ok if we could load the accumulated depreciation as at 12/31/16 tax book and proceed with mass copy from corporate book from Jan 2017 onwards.