How to represent multiple companies?
You just need a single account even if you represent multiple companies. Each new press release you issue is independent of the earlier press releases issued by you.
You can choose to issue all press releases from one pressroom (for example, your agency's pressroom), or you can create a unique pressroom for each company you represent in the same account and then issue each press release from the appropriate pressroom, all from the same account.
Note that the press rooms are visible publicly and all the press releases issued using a given pressroom are listed under it publicly.
Furthermore, latest press releases are listed under every press release belonging to the same pressroom. To turn this feature off, uncheck "Related PRs" option on the pressroom edit page.
A single account has many more advantages. For example,
To create a pressroom (i.e. business profile) -
Related Topics - Publisher | Press Release | Press Room
Related Faqs -