How to migrate assets to tax book

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Hi,

We have to migrate assets to Tax book but here is a catch. All the assets initially would be added in CORP Book and then via mass copy process would be added directly to Tax Book. However, there has been few adjustments that have been performed in Tax book assets like life change, Cost change etc. Now once the mass copy process is run it would automatically copy all the assets from CORP with Cost being copied from CORP and Life being copied from FA Setups.

However, since the user adjusted these in Tax Books how do we take into account all these while migrating assets to Tax Books ?