Remove old macs from apple ID

[shrtmkr]

Hey, does anyone know how to remove old macs that are associated with apple id's?
I was checking the warranty status of my mba's and I saw a lot of old macs that I longer use. How can I remove these?

 

[p.luik]

Why does it matter?

 

[shrtmkr]

when you have more than 19 machines on the list, It does matter