How to Manage FYI Notification on Contract Invoice Approval ?

Hi

We have a requirement for Invoice Approval Workflow.

The requirement is there are two level of Contract Invoice Approval alongwith FYI notifications to Project roles.

Step 1 → Invoice Submitted for approval to Biller

Step 2 → Invoice approved by Biller

Step 3 → Post the first level of approval by biller it should notifiy to three roles Project Manager, Project Cordinator and Financial Analyst (Its not mandatory all roles to be tagged to Project associated to Contract)

Step 4 → Level 2 approval by Client Invoice Approver

Step 5 → FYI notification post approval to Biller

The challenge I am facing is FYI notification to Project Manager, Project Cordinator and Financial Analyst after approval from Biller.