I found workable solution.
We need to map the domains. It’s doesn’t work automatically.
1.login to main wp-admin
2.plugin > active “WordPress MU Domain Mapping”
3. now add site (subdomain or re-wright to full-domain test.com)
4. If this is fist added site then your siteID is #2. You also can find siteID when you mouse-over sites tag.
5.Setting> active Permanent redirect (better for your blogger’s pagerank)
6.setting > domains > add newly create siteID #2 and test.com domain name.
This worked when I was writing this article.
Steps by steps links.
