How does the rule-based approval matrix work?

How does the rule-based approval matrix work?

1. Once the order has a selected supplier and the order has a total value
2. Click the  [Approve] button in the order head menu.
3. The below form will appear:

1. In the grid at the bottom of the form, a list of approval levels will show with the name of the assigned default approvers for each level.
2. Click the [Send Approval Request] button to send a request for approval to the approver on the first approval level.
3. Click [Close]
4. The user on the first level of approval will be notified that an order Is up for his\her approval, either by an external e-mail or by TM Master internal e-mail.   
5. Once the first level has been approved, the user on the next level is notified that an order is up for approval. For every level approved the next assigned user in line is notified. When the top level has been approved the order is “Approved” and can be sent to the supplier.