Multiple accounts linked to one login???

I have a new cloud client (City Offices) and they have a public portal to all public documents.  They are coming off of Laserfische (Yeah for the Win) and as some of you know Laserfische have a public portal program.  I was told that we can link Read Only licenses (They Purchase 20 for this) to one Login account to I can setup the URL to one login for their public site.  This way up to 20 people can be using the public portal at a time.  Does anyone know how this is done?

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