How to show only one label pr. line in a line graph?

Hi

I have a line graph
Which shows the number of orders for various brands during a period of time.
This is the specifications:

Vertical Axis: # Orders

Horisontal Axis: Date

Sigma Values: Sum(OrderCount)

Series Groups: BrandName

I would like to show only one label (with the BrandName) pr. line.
I would like to show this one label where the line for the brand hits its maximum.
Can you help me about what kind of expression I shall write where to accomplish this?