Revenue Tracking for additional opportunities against the same client engagement

Hi Team,

Would like to seek inputs on a business scenario:

Data Point:

1) Business is tracking the revenue for a specific client / customer engagement against a specific customer engagement code XYZ

Business Problem Statement:

1) In a specific Financial Year, there are scenarios wherein there is a requirement to capture the revenue against the same engagement code XYZ but for different opportunities

(The opportunity numbers shall be originated from Sales Force SFDC)

2) Note: Business does not want to create additional engagement codes for the same client rather track through some means against the same engagement code XYZ

3) Data Point: The client engagement codes are part of COA segment (Chart of Account)