Redirect olddomain/olddirectory to newdomain/newdirectory

No, because that isn’t how DNS works.

You can’t map a blog to newdomain.com and tell it to pick up the /newdirectory1/ part and stuff it in the URL. You would need to use a Multi NETWORK plugin for that.

Make a new NETWORK off of newdomain and go from there.

Just realized I’m in the main Multisite support forum with the tag WordPress MU Domain Mapping. So that’s actually the plugin I’m referring to.

As far as a Multi Network plugin, I don’t see how that could possibly solve my problem. What I’m looking to do is mask the URL (basically) to make it look like all the content is on the same domain. Like nike.com that has their different mini-sites as sub directories of their main domain (whether they have them on separate servers or not). I am separating the servers though, and would still like my “Old Domain” to be the main domain. But would like mysite.com/blog to go to other.server.com/wp1 but look like mysite.com/blog. This other.server.com would be a multisite install and would have others. So mysite.com/store could go to other.server.com/wp2 or sommething like that.

I was hoping I could maybe make a .htaccess change or something to this MU Domain Mapping plugin since it already works beautifully sending myothersite.com to other.server.com/wp3 and keep it looking like it’s still myothersite.com but maybe this is just a pipe dream or some custom php programming….

Domain Mapping – Transforms example.com/sitename (or sitename.example.com) into sitename.com

Multi Network – Allows you to have sitename.example.com/SUBSITE and by extension sitename.com/SUBSITE

It does what you’re asking, just not in the way you’re thinking ??

I was hoping I could maybe make a .htaccess change or something …

Can’t. Doesn’t work. We’ve all tried.