Legacy Asset Retirement and Sales

Hi All,

My Client went live in 2006. They want to upload the legacy assets now. Their Requirement is they want to see the asset history report every year from 1985. So they would like to upload the leagcy asset every year from 1985 by changing the takeover date . But there are certain legacy assets acquired in 1985 and retired in the year 1990 .For some assets acquired in 1986 the percentage of depreciation is changed in 1994 .how to address this in SAP ?

Regards,

senthil