It can be done but seek a legal opinion. It appears that the new Lots will be created from the existing Common Property. The new Lots will probably be classified as a Subsidiary Scheme of the original scheme.
Some more info here: https://rgdirections.lpi.nsw.gov.au/strata_schemes/requirements_for_a_strata_plan
and https://rgdirections.lpi.nsw.gov.au/strata_schemes/after_scheme_commenced/subdivision_of_common_property_only