Hi Nishu,
It seems that you were on the right track. The procedure to activate the declustering functionality on a side-by-side Hana is given in one of your link:
https://help.sap.com/erp_hcm_ias_2012_03/helpdata/en/d6/e9ae62080b4ec19946efb32e50d82a/frameset.htm
So, all these links seems to indicate that this is possible. Maybe you can have a try ?
Regards,
Frederic