How to calculate minority interest in onestream?

Dipali,

There's no "one way" to perform minority interest calculations...there are a variety of approaches that can be used.  The recommended approach will vary based on the customers requirements, complexity, dimensionality, etc...it could be custom consolidation rules or something as simple as a member formula.

If this is specific to a customer/design, I would suggest you reach out to PartnerEnablement@onestreamsoftware.com for additional assistance.

Is there any reference for this in GolfStream Demo application?

No, I don't believe so.