Project Custom Fields in Odoo let you add extra details to projects and tasks based on your workflow. You can create fields like priority, customer reference, project type, site location, due date notes, approval status, budget, or technical remarks. This keeps important information in one place instead of Excel or chat messages. Custom fields also help in better filtering, reporting, and assigning tasks, so your team can work faster, reduce confusion, and manage projects more clearly from start to finish.