There are so many apps integration with IDG.
1 user has many accounts e.g. K12345 is the primary account in apps. and B12345 is the secondary account in the same app. However IDG use the IDM to be the trust source but in IDM keep user information of primary account only.
Can we design the business rule in IDG to correlate this primary and secondary account that belong to the same user.
Yes, this can be accomplished through a correlation rules which you can customize to locate a unique identifier between the 2 accounts; email addresses for example, then use that to match the 2 profiles up. You will like need to create a custom field, something like 'Secondary ID' to store the secondary ID.