EPBCS with multi Company with multi COA

Summary

Please share your idea about EPBCS with multi Company with multi COA design

Content

Dear Sir

Would like to ask your idea about how to design Account dimension for group Company that have 6 company with 6 different Chart of Account (one is main COA other is subsidiary COA)

Each company COA will duplicate some of member ID but different meaning.

And for each COA have around 3000 members

What's good design for this if we need to keep all level0 COA in Application.

Should we split cube for this or what else idea.

Thank you

Chiaranon