sum function with more filters

Hello,

I hope someone can help me with the next question…

I've got a excel table (from access) with the next data:

Project Element
P33260 Fase A01
P34122 Fase B05
etc

I want to use the next JetReports formula:
=NL("Som";"Projectpost";"Aantal";"Projectnr.";D5;"Element";E5)+NL("Som";"Projectpost";"Aantal";"Projectnr.";D6;"Element";E6) etc etc

I can make a range for the filterfield "Projectnr." and also for the filterfield "Element" but I need to combine these filters. Hope you can help me!