Recently I found the need to do some mass changes in durations that I could not accomplish with a Global Change in the Primavera software. So I decided to export the data to an XLS file, edit that file, and then import back to the Primavera schedule. After my first attempt I realized the Remaining Duration Values I edited did not import correctly. After retrying the process another 3 times, I realized something else had to be wrong.

 

What I found out is that you have to pay close attention to all the data you are exporting/ importing. Though I changed my Remaining Durations, I also had imported/ exported my Finish Dates. Though I imported my Finish Dates I did not edit them, and their unchanged values overrides the changes I made to Remaining Durations. The simple fix in my case was to no longer Import/ Export the Finish Dates and adjust only the Remaining Durations as before.