How do I concat values that share a common record id?

Question

How do I concat this to this....

Record #NameRelated Item0158Dodge06052120164FordNull0178BMW02061200178BMW0206121

Record #NameRelated Item0158Dodge06052120164FordNull0178BMW0206120, 0206121

hellyars · Accepted Answer

Never mind, I used the Sum tool, grouped by A and B and concat by C....