question about updating asset records for purchase accounting

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Hi, 

   I am working as a contractor to update assets in F/A as a result of an acquisition.  The topside depreciation is accounted for in the corporate ERP, but we need to push down this information to the asset subledgers in Sage.  We need to update the following asset master fields with new values that have come from an external business valuator:

   - Acquisition Date

   - Fair Value 

   - Life (the Estimated Life field?)

   From these updates, we hope that Sage will recalculate the depreciation in a new book. 

   Has anyone out there had to do something similar in Sage F/A?  We have about 5500 assets that must be updated.  Here are my questions:

   -  Is it possible to do a bulk update to asset records in Sage?  I know that you can do a bulk asset create.  What are the capabilities for updating asset records? 

   - right now, the Class field in the asset record drives the useful life.  Is that a configuration that can be overridden or is it hard-coded logic within the application? 

   - if we change the fair value and useful life (I think the new depreciation method will be Straight Line), will Sage recalculate the depreciation? 

   Thank you for any info you can give.