You may want to edit your post to remove a little personal info, by the way.
You can concatenate strings in MDX using the + sign. You might try something like:
[Project].[Project Code].CurrentMember.Name + [Task].[Task Code].CurrentMember.Name
But for that to work, you're going to have to put Project and Task on rows, so I'm not sure that's going to provide a ton of value.
The other concern is that when you add a measure like that, it will always return a value and will cause you to show every combination of project and task, even if other measures are null. So you may want the measure read like:
IsEmpty([Measures].[Your Other Measure])
,[Project].[Project Code].CurrentMember.Name + [Task].[Task Code].CurrentMember.Name
If that doesn't do the trick, it's probably best to ask for further help with MDX at: