The NF (NAV Flow Filter) function provides a fast way get multiple fields from your NL. The NL (table look up) creates a record key which the NF function references. It is often referred to as a Flow Filter.
=NF (Key,Field,FlowFilterField_1,FlowFilter_1,FlowFilter_2,..., FlowFilterField_N,FlowFilter_N)
One or more NF functions can be used with a single NL function that has the NL