Hi,
Yes you can form an association without amenities in place.
In Karnataka there are two ways of getting the Association formed one is under Karnataka Society Registration Act, which is a simple procedure:
(i) Call for a meeting of all the flat owners by sending 21 days Notice.
(ii) 2/3 majority of voting and select the committee members.
(iii) Need a list of minimum 7 committee members.
(iv) One each passport size photo of Committee members
(v) Any Bangalore Residential Address proof or a copy of Sale deed of committee members.
Submit the Documents with the jurisdictional Registrar of Societies.
the Second way is to get the society formed under the Karnataka Apartment Ownership Act, which is a lengthy procedure, but every effective as it protects the rights of the Apartment Owners and their undivided share in the property. Once the Apartment amenities are completed you can asked the Builder to register the Society under this Act.
Meanwhile, you can even a form a Adhoc Committee for the maintenance of the Society, till the entire Project is complete.