Just like a customer can have many branches in acumatica, so should a vendor have many branches. From my research in the forums, there is no possibility to have many branches for a vendor.
I set up Acumatica as a vendor in my Acumatica ERP instance. Acumatica has several branches (WA, VA, Ohio, Canada, ..) . Each one has a different address. Since I could not set up different branches, I had to enter the office address for each Acumatica contact,
Maybe I am still missing information about vendor branches. If not, please enable many branches for a vendor.