Consolidating multiple company files is a feature that we are investigating and hope to have that as an option before too long.
In the meantime, what our clients have done is create separate Finagraph reports for each of the entities. If you're interested in doing that submit a request using the link above. Provide a list of the other company files you'd like to create a Finagraph for and support will add them to your dashboard.
You could then optionally use the Excel import method to combine the data from the businesses into a single combined Finagraph.