I am building directory listings for clients which each have there own stand alone subdomain running off a main domain. These are built in wordpess and are like mini websites that sit on individual sub domains. My dilemma is how to create a main page that can search to find these sites like a directory. ie I want people if they find the main site to be able to put in a search box plumbers and all the the plumbers that have a directory site that I have created will appear in a list. or put in plumbers Sydney and all the sydney plumbers will appear.
Is this possible to create something like this and if so what would I need to do to each subdomain site to match them for searches.
I am totally in the dark with this so any advice or suggestion how to better set up a directory site would be greatly appreciated. May even be a job for an expert if I decide I need someone to create for me.
Thanks in advance for any advice.