Yes, you can import your material items by a csv using the import/export tab to complete a bulk import.
Have a look at similar frequently asked questions or visit our FAQs page for more information
How does a Purchase Order create a bill in Xero and update stock in TidyStock?
How do I export a list of unreceived purchase orders?
Can refunds or credits be processed for Purchase Orders that haven't been received?
Can I add materials to a purchase order after it has been closed/received?
Are there any additional costs for implementing automated tracking in TidyStock?