Multi select the dimensions and assign global variables (previously called as Linked Value )

The use of linked values has been replaced by global variables in SolidWorks 2012.

In SolidWorks 2011 user had an ability to select multiple dimension from graphics and assign a linked values in one single command.

How to do this in SolidWorks 2012 version ?

It very time consuming to assign the global variable by selecting one dimension at a time.

SolidworksGeneral