Odoo-18.0-20251222/sale_substate/readme/USAGE.md

1. Go to ** Settings > Technical > Sub State Configuration ** and Add "Base Substate".
   If necessary you can add "Target State values" (ex define a substate for "cancel" state). Substate sequence is very important.

2. Create a sale order and check if the substate are displayed on the header of form view. Check if you can't set substate defined for sale if sate is a quotation.