Snippet to create Snippet in SSMS

Please try following:

1. Save this code as a create_new_snippet.snippet and add it to your SSMS through code snippet manager (Ctrl+K, Ctrk+B)

<?xml version="1.0" encoding="utf-8" ?>
<CodeSnippets  xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>Create_new_snippet</Title>
            <Shortcut></Shortcut>
            <Description>Snippet to create a snippet</Description>
            <Author>Denis Sipchenko</Author>
            <SnippetTypes>
                <SnippetType>SurroundsWith</SnippetType>
            </SnippetTypes>
        </Header>
        <Snippet>
            <Declarations>
                <Literal> <ID>Title</ID>        <Default>NewSnippetTitle</Default>         <ToolTip>NewSnippetTitle</ToolTip>                   </Literal>
                <Literal> <ID>Description</ID>  <Default>NewSnippetDescription</Default>   <ToolTip>NewSnippetDescription</ToolTip>             </Literal>
                <Literal> <ID>Author</ID>       <Default>Unsung Hero</Default>             <ToolTip>NewSnippetAuthor</ToolTip>                  </Literal>
                <Literal> <ID>SnippetType</ID>  <Default>SurroundsWith</Default>           <ToolTip>SurroundsWith OR Expansion</ToolTip>                  </Literal>
                <Literal> <ID>CodeComment</ID>  <Default>-- Sorry. I was too lazy to write some usefull comment here</Default>         <ToolTip>Comment for you code</ToolTip>                  </Literal>                
            </Declarations>
            <Code Language="sql"
                Delimiter="`">
                <![CDATA[<?xml version="1.0" encoding="utf-8" ?>
<CodeSnippets  xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>`Title`</Title>    <!--`Title`.snippet -copy/paste for filename-->
            <Shortcut></Shortcut>
            <Description>`Description`</Description>
            <Author>`Author`</Author>
            <SnippetTypes>
                <SnippetType>`SnippetType`</SnippetType>    <!--SurroundsWith/Expansion-->
            </SnippetTypes>
        </Header>
        <Snippet>
            <Declarations>
                <Literal> <ID></ID>     <Default></Default>         <ToolTip></ToolTip>                   </Literal>
            </Declarations>
            <Code Language="SQL">
                <![CDATA[`CodeComment`
$selected$`selected`$end$`end`
]]`fake`>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>
]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

2. Select your code (that you want to save as a snippet) and call Surround With... snippet (Edit\IntelliSense\Surround With... Ctrl+K, Ctrl+S)

3. Edit parameters if necessary (as Title, Description etc...) and save as [YourSnippetName].snippet into your snippet folder.