Adding custom hierarchy levels - KKBC_HOE

Hi Friends,

What's the best way to add a custom hierarchy level in summarization hierarchy KKR0 to be used in KKBC_HOE? I'm trying to add CO Product group and Origin Group in it, if possible. I know it's available for product drill down reports but my client wants to use it for KKBC_HOE to look at material/overhead usage variances.

Is there a user exit or should I change the table behind the scenes?

Thanks for your help!