Working with .omf

I received an .omf from these film guys.

I have worked on it and have inserts, group channels, automation, ect…

They change the edit, and send me an updated .omf…

How can I incorporate the .omf into the project I have already started?

Any suggestions?

You may have to use a new project for the updates then drag the changes over to your edited project.

It’s not a problem to import an OMF into an existing project. Open your project import the OMF, say “no” when Cubase asks you if it should open a new project. Cubase will create new tracks and place the audio there.
This is also great for creating template projects, e.g. if you’re mixing for a series, where you get a new OMF every week or so.