contain, category, domain, sub domain, url how to explain

as my previous post, i mentioned that i had to build 2 website. it's hard when it's the time to explain how to make it real. whether they want it to be a category, or they want it to setup in subdomain.

i make some drawing or can i say illustration to explain to them how its works. but yet they unable to see it clearly.

and that is my problem as i mention to my friend earlier. its hard for me to explain in not technical terms to costumer as i through this in hard way.