CHANGE EXECUTION - Edit proposed Change - missing "new revision from"

Dear community,

there is a question raised by a customer: 
Why there is no option for "new Revision from" at proposed change?
The idea is to create branches as design variants before change and release process.
If a design variant is choosen as new solution, the released solution shall be updated with change process while "new revision from".
Currently, customer keeps proposed solution empty and execute "new Revision from" und active CA within Collaborative Lifecycle.
The idea is: to define the new solution inside CA as proposed solution and assign it with CA activation to "in Work" to update drawing and other documents.
Could it be implemented?
 br Thomas Degen (TECHNIA)