I have Customer and Salesrep group
I need to Dynamically choose the group to sort
I went in to top N/sort group expert, what ever is in the first sorting group is the sorting first.
this changes how ranking of the amount.
somebody helpppppppp.

create a parameter with Customerand sales rep as values to chose.
create a formula
if ?param = 'Customer' then
tab.cust
else if ?param = 'Salesrep' then
tab.salesrep.

group on this formula

thank you very much for your help.
that do the trick. One thing I had to try to under stand was.
tab.cust (I changed this to {table.customer}, took 1 min to understand what tab.cust was.
once again thank you ;)

sorry to make u wonder.