On the Portuguese FIR’s, Arrivals shall be set by using

C/S | ADES | ARWY | ATYP | WTC | CFL | STAR | other optional

Arrivals Flight List is used to have an overview of the aircraft that have the corresponding ADES chosen on the Filter to the ICAO Code present on the FlightPlan.
On the ADES, you should set the ICAO Code for the Aerodrome you are controlling. If controlling a center Position, or an Approach Position, you can either simply use “LP” on the ADEP, or just add the main aerodrome, then on the flight list click on the horizontal strips and select “add”. This will open a new filter window, that will show the selected filter on the same Departure Window.
On the RWY, you should always leave it blank, as there is currently not defined in any airborne label state the arrival runway

This flight list is useful especially for airborne sectors, to have a preview of the traffic that is going to arrive at each aerodrome.