New_Changed_and_Deprecated_Features_for_Microsoft_Dynamics_AX_2012.pdf
www.microsoft.com/.../details.aspx
It is deprecated. Quote from depreceated features doc:
Reason for deprecation: The underlying architecture of Microsoft Dynamic
AX 2012 was modified, and these modifications
required the duplicate company feature to be
deprecated.
Replaced by another feature: No. The feature is no longer available, and there
is no replacement feature.
Although there is no replacement duplicate
company feature, a company can still be used as
a template to create other companies. By using
the import and export feature, users can create
duplicate reference, setup, and master data by
copying data between two companies. For demo
data, the import and export feature can be used
to replicate a company from one environment in
another environment, or in the same
environment. Users can also make further
changes to create an appropriate demo scenario
in the new company.