PCM How to manage Change Requests within PCM

This is my scenario:

I have a new request which needs to pass thru a few phases.

For each phase ,each approval process may need a few approvers.

THe first phase is to approve a CR for a HIgh Level Impact Assessment.

The second phase is for a detailed impact assessment.

For approval of this phase, it needs to be delegated to the correct authority level.

If I use Change Management and the four phases, unless its a Change Order, this is the only item that has a workflow approval process.

All other items such as request for proposal , proposed change order do not have a workflow process.