I’ve never changed the main site URL (scenario 1), but I know it’s possible: three relevant links found in a quick search.
For the second scenario, although not optimal, the standard procedure applies:
- install the plugin WordPress MU Domain Mapping
- park the TLD
mynewsite.com
in your Control Panel and point it to the folder of the main site - create a sub-site
new.mysite.com
in the Network and use the plugin to map the domainmynewsite.com
to it - enable wildcard subdomains for
mynewsite.com
in Control Panel - create a sub-site
new2.mysite.com
and map the sub-domainsite2.mynewsite.com
to it
All the mapping process is well explained in the following tutorials:
-
Multisite Domain Mapping Tutorial, by Otto
-
WordPress Multisite Beyond Basics: Essentials and Domain Mapping, at wp.tutsplus.com
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