If your order requires approval, you'll be able to send your order to a manager when you advance to the cart: 

Once submitted, your view should look like this: 

Once sent, no amendments are able to be made to this order. You will have to wait until the order has been approved or rejected amend or create a new order entirely. 

When the manager has approved the order your cart will be updated: 

The order can then be placed and sent to the respective suppliers.