Go to Inventory > Configuration > Settings and enable Landed Costs in the Valuation section. You will then be able to specify Landed Costs by going to Inventory > Operations > Landed Costs. Please note that Landed Costs can be used only in cases where your inventory valuation is done using FIFO and the valuation is automated.

[2025 Update] Product-Specific Landed Costs Solution

For anyone finding this thread while searching for a solution, here's an update on handling product-specific customs duties in Odoo:

The Standard Odoo Limitation: As correctly noted above, Odoo's native landed costs module applies costs across all products in a receipt. The workaround is splitting receipts, which works for occasional imports but becomes impractical at scale.

Automated Solution: The Customs Duties add-on (https://apps.odoo.com/apps/modules/19.0/import_fees) was developed specifically to address this limitation. It's now available for Odoo versions 13.0 through 19.0.

Key features:

• Assign HS codes at the product or category level
• Automatically calculates duties per product within the same receipt
• Products without HS codes are excluded from duty calculations
• Supports multiple currencies and country-specific duty rates

When to use manual vs automated:

• Manual split-receipt method: Fine for occasional imports (< 5 per month)
• Automated calculation: ROI typically achieved within 3 months for regular importers

Additional resources:

• Setup guide: https://www.odooskillz.com/blog/odoo-skillz-insights-1/customs-fees-a-guide-to-hassle-free-calculations-5
• Technical documentation: Available on the Odoo Apps Store listing

Hope this helps anyone dealing with the same challenge!