i have three subs that do not work on my site. i get an error page when clicking. in whm, where so i look to resolve. I assume somewhere under DNS but everything seems good there. any info would be great.

It should work if you set it up correctly. Are you using your own DNS or SMs ?

Sometimes restarting BIND and waiting for the subdomain to propagate like in about 6 hours might do the trick assuming you got everything set up correctly.