Thanks for your reply.
The results is what I'm expecting, but I would like to keep the Index result independently of the dimension I put in the table.
For example, if I drop the customerId and BrandId fields, I'd like to have the same results, i.e. :
Does it make sense?
One possible solution is to create a unique ID field = Customer ID + Brand ID. Add that to your columns then hide the column. That will keep the Order Id and Index intact as you displayed above.
Thanks for your reply. Good idea, I didn't think about it but it works!