1. a person or thing that itemizes; one who breaks down or lists items individually
Usage: chiefly British spelling; American English typically uses 'itemizer'

Examples

• The accountant is an excellent itemiser of expenses for tax purposes.
• The software acts as an itemiser, breaking down the invoice into separate line items.
• As a careful itemiser, she documented every cost in the project budget.
• The itemiser tool helped organize the shopping list by category.
• He worked as an itemiser in the billing department, ensuring accuracy in all charges.