Insert a new line in BI IP

Hi,

I need to create a BEX build on a agregaion level with BI-IP and to allow user to insert a new line.

for example, if this is a report on customer, i need to allow the user to open a new line with a customer that is not present in the

original bex output .

Do you know how to do that? is it a definition in the query level?workbook level?

Thank you in advance.