How to reduce asset cost price?

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Hello,

We became VAT registered this year, and there are a number of assets we bought over the past few years that we've now been able to claim VAT on.  These assets were originally recorded in the Fixed Asset Register with a cost price of their gross value.  We now want to reduce their cost price to the net value.  Is there a way to do this in Sage 50cloud v26. 

Kind Regards

Jonna