Hi Manoj, in your case I suggest you to use the rel="alternate" hreflang="x" geotargeting tag, apart from targeting the subdomain to the desired country (and the main site set as "global").
The use of the rel=”alternate” hreflang=”x” is strongly suggested in the case a website as an “incomplete” international version for very different reasons:
- Template translated, but main content in a single language;
- Broadly similar content within a single language, but targeting different countries (i.e.: US, UK, Australia…)
But remember that Google suggests to use it also in the case the site content is fully translated (i.e.: all the Spanish version has content in Spanish, and so on).
This rel, then, seems very appropriate for the Sitecore site.
How to implement it
Two options:
- HTML link element. In the section of any page.
In this case, for instance, in the section of www.domain.com we should add as many rel=”alternate” hreflang=”x” as the different country versions are present in the site.
I.e.: http://es.domain.com” />
Please note that if exist multiple language versions (“set” in the Google slang), every set must include the rel=”alternate” hreflang=”x” to every other language versions.
I.e.: if we Global, UK and FR versions of the site apart the Spanish one, the Spanish version will have to include:
Obviously, every single URL must have the rel=”alternate” hreflang=”x” tag pointing to the corresponding URL of any other language version.
- HTTP header, in the case of not-HTML files (as PDF)
As it is implicitly said, this tag is used on a page level, not domain one. That means that every single pages must be correctly marked-up
Same content and same language on different pages and language versions
If, as it happens in case, some pages show almost the same content in both the domain and subdomain, hence it is highly suggested to use also the rel=”canonical” in order to specify to Google what the preferred version of the URL is.
As Google itself says here, Google will “use that signal to focus on that version in search, while showing the local URLs to users where appropriate. For example, you could use this if you have the same product page in German, but want to target it separately to users searching on the Google properties for Germany, Austria, and Switzerland.”
Don't forget
Don't forget that your main site is set a targeting all the web, also the country targeted by your sub-domain.
That means that if you will perform an active link building campaign for the sub-domain, in order to provide it of an equal if not higher strenght respect the main site.