Sort a group on a calculating field

[Boomkweker]

In a report I group bij customer. This customer is buying througout the year different products. On a bill to the customer is quantity bought and price this create a field which is called linetotal. In the report now I let all the same articles throughout the year come together and make a total of all the linetotals per article. Is it now possible to sort in teh group of the specific customer on SUM[linetotal]

[ranman256]

youd sort by: Year, Customer, (Date if needed)
and SUM in the customer footer.