Need to flag projects status,currently the projects didn't have status.

If we want to close all the task starting with "INTUITIVE_***" assigned to a user (the project has been already closed),it's impossible for us to close the tasks in batch,We were wondering if it's possible to flag the project status,in that case when a project was flagged as 'close',all its tasks will be considered as 'invalid' automatically,then we don't need to deal with the 'invalid' tasks.