Exactly! A hash slice, but i would also use an array for the field names:

# untested
my @fields = qw(
    partner
    kampagne
    keywordCluster
    keyword
    clicks
    leads
    orders
    jaronVerguetung
    partnerVerguetung
    profit
);

@fields{@fields} = $csvIn->extract(@fields);
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)