Awk
solução:
awk 'BEGIN{ FS=OFS="|" }
{ a[$1 FS $2 FS $3 FS $4 FS $5 FS $6] += $7 }
END{ for (i in a) print i, a[i] }' file
A saída:
11|ABCD|19900101123123445455|555|AAA|50505050|9004230
13|ABCD|201803010YYY66666666|600|ETC|20180300|84099