Hi,
It is possible to crerate a new aDSO with an object template, e.g. a classic DSO. Please also refer to SAP Help. I don't know if you have such object templates, e.g. for migration of current classic DSOs or do you have to create brand-new objects?
In the latter case, a two-step approach might help you. You write a small program which is using the BAPIs BAPI_ODSO_CREATE (to create a classic DSO) and BAPI_ODSO_ACTIVATE (to activate a created classic DSO). The classic DSO created in the first step can then serve as an object template for creating the aDSO in the Eclipse-based modeling environment.
Best regards,
Sander