dik has it exactly correct
To go one step further, I make two lines in the title block take their text from the paper space tab. That way when you print the drawing to a pdf, the default name of the drawing which is the file name + tab name matches the title block name. This is done by inserting a diesel field instead of text for those two attributes. It's also easier to edit the tabs that the block attributes.
My tabs are "xx drawing title" and the diesel expressions are $(substr,$(getvar,ctab),1,2) for the drawing number and $(substr,$(getvar,ctab),4) for the title.
My attribute for drawing number is "job number-" and then the field.
To insert a field, edit the attribute, right click and pick insert field, then find and click on Diesel Expression then copy paste into the box