Hi, thanks @Pawan. However when you import the Customer data, ERPNext ignores the incoming customer IDs, and sets it’s own. This means I don’t have a way to link all the other data I need to import back to the customer, because the ID will not match.
This was previously mentioned here and here
Edit: If there is a way to set Customer ID on import please let me know, it would save a lot of time. Thanks again!