Activate Sub asset accounting for existing assets

Dear SAP Friends,

My client wants to activate Sub asset accounting (Componant acounting for Assets) for existing assets which are already depriciated.

Want to know wether it is possible for the exising assets which are already depriciated?

If yes; what are the steps for the same like do we need to ravalue assets and then do the same and what to do with the existing posted depriciation.

If No; what is the workaround for the same. or they need to follow the sub acounting for newly created assets only not for existing assets.....

As it is something new to me.... need your guide line to do the same.....

Thanks & Regards

Sagar