Excellent! Is working now.
Thanks for your help!
I see that plugin is working (make the redirect)
On the panel everything seems right (I click on mysite.com/subdomain and is redirect to myotherdomain.com) but the mapped domain don´t show the site (instead of that, they show the under cosntruction page of godaddy). Godaddy told me that A name is working but they need see the folder of the redirect site. They said that I need create the folder and put all the files there (I think that technical support guy don´t know about multisite)
The message that I have on my panel is Health Status: Invalid.
And I don’t know what to do. Two weeks ago my site was on hostgator, and they told me that can´t help me with this issue, and now Godaddy they don´t know what to do.
Help me please or recommend me another hosting company.