Council Development Application….what strata approval is required.

I am seeking to understand who has to give approval for lodgement of a development application with Local Council in NSW, or an application to amend a prior development approval.  The prior approval is the original approval for the strata complex to be constructed. We wish to only make chages to one lot, but it seems this may most easlily be able to be approved Council by ammending the origional development approval.

So do we need the approval of the Body Corporate, and what type of meeting and resolution is required? to enable us to lodge application with Council on behalf of the Body Corporate.

Thanks for any guidance available