Final answer:
The section of the change management documentation that details the original configuration is the Configuration Management Plan, which includes information on baseline configurations used to reverse changes if necessary.
Step-by-step explanation:
If you are executing the primary plan in the change management documentation and realize that you cannot proceed, the section that details the original configuration is the Configuration Management Plan. The Configuration Management Plan typically outlines the procedures and methodologies for how configuration items are identified, managed, documented, and controlled within the project or organization.
It should document the baseline configuration, which is the approved technical and functional configuration at a point in time. Therefore, if you need to refer to the original configuration, this is the document you would look to. It’s important to have this information handy to ensure that any changes can be reversed if needed, so you maintain the system's integrity and minimize disruption.