I need help creating a list for the market. I was able to do this at the retailer level, but how do you do the same thing for the market. I need to be able to do this so that I have the code for the market.
It seems you are working on Data hub model, so as per the best practice don't create hierarchy lists in data hub. You should create a Flat list and system module for the mapping and then from this system module you can create your hierarchy lists in your spoke model.
If you want to do data validation then you can create hierarchy lists in data hub. for more details you can refer below link: