thanks for suggestion but not really a solution as it means creating 50 websites. that was the whole point. I dont want to make 50 sites or 50 seperate DNS zones for the domain names.
I just want to have them point, using DNS A record entries in ISPConfig , to a single web site hosted on my ISPConfig and then add in pointers to my ISPConfig NS server at the registrar of the 50 domain names.
so far any attempts at adding A records, CNAME records or any kind of record containing the domain names form inside the planned hosting web site or anywhere on my ISPConfig DNS still throws up an error when testing to say my NS servers are not the authority for these domain names and the wwworld cant find them.