Hello  Alec, 

Following are the few thing you can make sure,

1. The Billing Address Is Not Linked to the Company
   • When importing, the billing address must be a separate row and linked to the parent company using the external ID (or database ID) of the company.
2. Missing Address Type (Type: Invoice)
   • The column "Type" (Field: type) must be set to "Invoice" for billing addresses.
   • Similarly, for a shipping address, you must set "Type" to "Delivery".
3. The Address Is Overwriting Instead of Adding
   • If the imported address doesn’t have a unique "Name" or "External ID", Odoo may overwrite existing addresses instead of adding new ones.
     

Also, you can import both billing and shipping addresses for a contact (company or individual) in one go. Odoo allows multiple addresses per contact as long as they are structured correctly in the import file.

Example:

How the above Works:

• The company itself (ABC Ltd.) is imported first.
• Billing (Invoice) and Shipping (Delivery) addresses are added as separate contacts but linked to the company.
• The "Parent ID" column ensures that Odoo assigns the addresses to the correct company.
• Each address has a unique External ID (address_1, address_2) to avoid overwriting.

Also, avoid following mistakes while importing: 

• Missing "Parent ID (External ID)" → The addresses won't link to the company.
• Duplicate External IDs → Each address must have a unique External ID.
• Not specifying "Type" → Odoo won’t categorize them as Billing or Shipping.

If this helps, please upvote the answer! 🚀