asset management

Dear Experts

Please help me

In asset i created building asset master and given 8 years deprecation and i run AFAB last 6 monts deprecation .[ IT IS TOTALY ENTERED WRONG IN MASTER DATA AND DEP YEARS]

Now i want to transfer building asset to furnature asset [ same company code] and need to give 5 years deprecation

Please tell me

1] how to transfer from one asset master to another and how to calculate past 6 months dep to show in accounts

2] what can we do that 6 months deprecation calculation , how we manage that

Regards

B