How to retire splitted assets

Hello,

we have special issue. We have assets assigned to multiple dist lines. For example:

on Balancing segment A 0.5 peaces

on balancing segment B 0.3 and on balancing segment C 0.2

now we have the requirement to retire only the part B and C.

Do you have idea how to perform this action? Because on the retirement screen we have only possibility to choose the cost value and not the distribution lines.

Pls advise!

Thank you,

Károly