Group accounts that are branchs of the same company

Group accounts that are branchs of the same company

Hi all!
This is a zoho books question. many of the companies we work with have several branches. Each branch has it's own tax number. I'd like to be able to relate these branches so I can treat all the translations as if they were made with the parent company.
To further clarify: In reality we deal with the same clien "john doe" who has several shops, each of them with it's own tax reg number. We invoice each shop, but we would like to treat them as one in regards to reports so we can better keep track of credits with that client.

How could I get such functionality with books?

Cheers!