The only way I can think of to have the title block the same on all of the sheets and tied to the main assembly would be to have the main assembly in each sheet. It can be hidden or the view can be off of the sheet. This may not make any sense, though, if your assembly is large.
Thanks for your answer.
But we can do that by right click on the sheet --> Properties --> in "Use custom property values from model shown in" drop down list box (left bottom) we can choose the main assy dwg view and it will link to that file properties by itself.