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01 Joe
02 Ed
03 Sam
04 Wendy

yadda 01 abc
yadda 03 sss
...
yadda 02 azdfbc
yadda 04 azdfbc
yadda 04 abdc

foreach (@transactions) { #there are dozens of employee numbers…
    if ($_ eq 01) {     push (@joe , $_) ; }
...
    if ($_ eq 04) {     push (@sam , $_) ; }
    if (no others) {     push (@unregistered , $_) ; }
}

foreach (@transactions) {
    push (@the_correct_employee’s_array_based_on_number , $_) ;
}