Security when using Extended Dimensionality for differents LOB

Many thanks JackLacava.

In this case we are going to have an Entity dimension with Corporate entities (Cube Corp) and we will be using the Extended dimensionality for a  specific Subgroup (Cube Subgroup) . Same for account Dimension: a Corporate chart of accounts  and a Subgroup chart of accounts using Extended dimensionality. Subgroup want to work in an independent way:  themselves can create their own users (Corporate cannot create users for this Subgroup) and  their own accounts and entities. In Summary want that Corporate cannot do nothing related to its subgroup (even users creation and access) . Would be possible to avoid that Corporate can do this ?