This doesn't make much sense as Terraform is for declarative infrastructure. It only make sense if you have an array of orders and keep adding orders and have an order resource with a for_each where you turn that array into an object with a unique key (maybe a hash of the date and line items). What happens if you delete an order from that list, though? Well, you will also have to delete it from the state then. Anyway, this is an abuse of Terraform. Best would be an CLI or TUI.