How to link a normal asset with a leased asset ?

Summary:

User is trying to link one normal asset with a leased asset for which amortization schedule is already generated

Content (required):

Hi All,

Business user created a leased asset (LA001) in the month of September with a value of X. Amortization schedule was generated subsequently. 

Now, he later realized that he forgot to add the tax amount (Y) in the asset value. This amount anyways could not have been a part of the leased asset as i was a one time payment and no amortization schedule was required to be generated for this. Now, user wants to link this Y amount with X amount by creating Y as a sub asset under X and when we dispose off X, Y also gets disposed off automatically.