How do we add additional cost details to a capitalized asset?

Need the ability to add additional asset cost to an already capitalized asset.  These cost are generated via GL entries for miscellaneous adjustments, etc. Right now if you just update the current cost under book controls the source line details will not add up to the new cost and there is no way to reference the source of the adjustment. Need to add the source details as well for audit control/reconciliation.

How do most companies handle this type of scenario.