to reverse the progress % completion

here is how to destatus a schedule 

1. copy the current schedule

2. Choose Enterprise, Projects and select the Calculations tab. Choose to "Link Budget and At Completion for not started activities" and "Reset Remaining Duration and Units to Original

3. Choose View, Columns and add the columns for Actual Labor Units, Actual Nonlabor Units.

4. Choose Tools, Schedule and set the data date equal to the Project Start Date and schedule. To find the Project Start date, choose Enterprise, Projects. Click on the Dates tab and note the Planned Start date. 

5. For the first activity in the list, set the Actual Labor Units to 0. Highlight the activities in this column and choose Edit, Fill Down.

6. For the first activity in the list, set the Actual Nonlabor Units to 0. Highlight the activities in this column and choose Edit, Fill Down.

7. Choose Tools, Global Change and run the 1st Global Change. This will set the Actual Material Units to zero.

8. Run the 2nd global change which sets the activity status to Not Started

1st Global Change

Subject Area: 

Activity Resource Assignments 

Where  Resource Type                  equals                    Material

 Then      Actual Material Units         =                             0 

2nd Global Change

Subject Area:

Activities

Where                  Activity Status                   is not equal to                  Not   Started

Then                      Activity Status                            =                                  Not Started

If this process is not used you may encounter the following error:

"Cannot set status to Not Started if activity has actuals."

3rd Global Change

Change duration to activities by running global change for Not Started activities

Subject Area:

 Activities

Where                  Activity Status                   is not equal to                  Not   Started

Then                      Remaining Duration               =                                    Original Duration

If you are recreating a schedule from an as-built schedule 1^st export the actual durations to excel then import the actual durations as original durations.