There are many ways this can be achieved but I feel the simplest way I can see to achieve the result you require is to:
1. Take an unprogressed copy of the schedule,
2. Use Tools, Tracking, Update project and update the project to the current status date. MSP will calculate both the detailed and summary % complete based on the work progressing according to plan.
3. Copy and past the values from the % Complete Column into a number or text column of your current schedule.
You will need to add or remove lines in your unprogressed schedule to match your current schedule.
The summary durations are calculated on the sum of actual durations divided by the sum of all the durations and does not give an accurate measure of progress unless all tasks are of equal value.
Hopfully some one else may have a simpler solution for you.
Paul E Harris
Eastwood Harris Pty Ltd, Melbourne, Australia
Planning and Scheduling Book Publishers, Training & Consulting
www.eh.com.au