JPMC Embedded Solution : Clarification on ISO Domain,Family and Sub-Family

Hi Team,
As part of JPMC embedded solution, we would like to get a clarification on below items
i. Do we need to define code map groups
ii. JPMC has shared a list of transaction codes with us and some of the transaction codes have same Domain, Family and Sub-family.
We do understand that the bank statement transaction codes get created automatically in production based on JPMC bank statement but would like to understand whether we can have multiple transaction codes with the same Domain, Family and Sub-Family