I would like to lookup different fields for an entity, how would I do that? How many relationships do I define?
PlanName, PlanAccountID, PlanDescription
I would like PlanName, PlanAccountID map into name, AccountID for the Plan Registration Entity when I do a lookup in PlanRegistration Entity
If you want to have multiple lookups to a parent record then create multiple relationships.
But I'm not sure I fully understood your question, perhaps you could elaborate please?