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In 2012 R2, there is no special wizard to add essentials into an existing domain. If you follow *all* of the steps on the document you linked to, it'll work. But it is important to notice that one of the first things mentioned on the page you linked to is &quot;if the essentials wizard starts, cancel it.&quot; &nbsp;That is important in introducing essentials into an existing domain in R2.
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In 2012 R2, there is no special wizard to add essentials into an existing domain. If you follow *all* of the steps on the document you linked to, it'll work. But it is important to notice that one of the first things mentioned on the page you linked to is "if the essentials wizard starts, cancel it."  That is important in introducing essentials into an existing domain in R2.

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Yes, this is what I was missing. I forgot to install AD, duh.
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Yes, this is what I was missing. I forgot to install AD, duh.

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I am migrating SBS 2003 to Essentials 2012 R2, I've done 2 previously but am missing something. <br />
Following the document below I've done all the source server prep, everything appears good but when I continue the installation on the 2012 server I only get the option to install as the first domain controller, I don't have the option to install in an existing domain. What have I missed?<br />
<a href="http://technet.microsoft.com/en-us/library/dn408637.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/dn408637.aspx</a>
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I am migrating SBS 2003 to Essentials 2012 R2, I've done 2 previously but am missing something. 
Following the document below I've done all the source server prep, everything appears good but when I continue the installation on the 2012 server I only get the option to install as the first domain controller, I don't have the option to install in an existing domain. What have I missed?
http://technet.microsoft.com/en-us/library/dn408637.aspx

2003 to 2012 R2 Essentials Migration

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.