Thanks for getting back to us, @jlb1063. I understand how you want to import inventory to 12 truck sites. As an insight, the Site field isn't included in the IIF file form.
You'll want to explore some third-party apps that can create a mapping to import transactions. Visit the QuickBooks App Store to find the right apps that suit your business.
For future reference, check out this article for more guidance on importing items: IIF Overview: import kit, sample files, and header.
Let me know if you have more questions, @@jlb1063. I'm always around here to help you more about importing.
