I am about to enable Communities in a production org in which customer & partner portals have previously been used with custom URLs through Setup > Domain Management > Domains. The current custom URL is http://CompanyName.force.com with the path directing the user to the different portals.
Is it possible to use this same custom domain and have the path direct the user to a Community when a community is used and to a Portal when a portal is used? If so, what do I enter in the domain name input field when enabling Communities? Because when I do enter the current custom domain, the system errors.