It is possible to use Global wiki templates in local wikis without importing the templates. In this manner, we can keep templates updated with the global source.
Interwiki template transclusion
In order to transclude a template from the global wiki we will need to use this syntax in the wiki source editor:
{{Global:Template name}}
this will enable the use of the Global wiki template named Template name in the destination wiki.
Interwiki page transclusion
In order to transclude a page from the main name space from the global wiki we will need to use this syntax in the wiki source editor (note the double colon mark):
{{Global::Page name}}
Or if the page is nested in a namespace than use:
{{Global::Name Space name:Page name}}
Where Name Space name is the name space prefix (i.e. - help:)