Wrong mapping of projects to asset

 Hello,

Client had wrongly mapped 2 projects to one asset.

For example: ProjectA and ProjectB should have come as asset A and assetB,but user has done a mistake and ProjectA and B are there in oracle asset in assetA now.this is done in the Aug-09,now open period is Oct-09.Now we wanted to know what is the best way to create assetB and map the project B so that  when we drill down the assetB then we should be able to see project B and when we drill down the assetA then we should be able to see project A .