Clear completion percentage for all tasks

GanttProject Desktop Support
#1

I have a set of about 50 tasks from a project from last year. They are all currently set to 100% completion since the project was completed successfully last year. How can I go in and set the completion to 0% for all of those tasks for this year, without having to go in 1 at a time to do so?

Thank you.

#2

For mass updates either CSV export or direct editing of the .gan file (it is text/XML which can be edited in any text editor) are the best ways.

#3

perfect, this worked great, thank you!