Still have a problem with that.
In fact my problem is simple :
I would like to get for each day/weeks the total of work done on each account (as said before defined in a text field)
I can build a graph in MS Project that will display this, I can display the result table bellow this graph. But i do not succeed to export these data.
I expected to to it with the report export feature as explained above. Bu even if i can get this field displayed in a table, is is always dependent on a task. No way to get my text field as main field in the pivot table .

So ok, I can always copy the table and use excel to start another new pivot table. But I quite sure there should be a better solution.