I have five sites a.com, b.com, c.com, d.com and e.com.
I have one install of wordpress on x.com
I have five categories on x.com set-up for each of the five sites a, b, c, d, e.
On the five sites I've set-up five URLs of a.com/blog, b.com/blog, c.com/blog, d.com/blog and e.com/blog.
I have an iframe running on each of the five URLs and in each case the iframe displays the relevant category.
So, on a.com/blog the iframe shows the content of the category 'a' which is in fact really content from x.com/a
If someone does a Google search and is directed to my site, the URL displayed/returned is x.com/a/slug-name-etc rather than a.com/blog/slug-name-etc or a.com/blog/a/slug-name-etc
I understand why. Using an iframe wasn't the cleverest idea.
How do I run one install of wordpress on x.com but publish blogposts on a.com which Google will pick-up as being native to a.com rather than coming from x.com?
[The reason I want one install is that sometimes blogposts are suitable for publication on both a.com and b.com, so I want it to be as easy to do that as possible.]