Propery auto update

I have created a standard sheet format for my customer. Part of thier requirement is to include the project title and project number in the title block. I have created custom property fields where I pre entered the text for the project number and project title. It all works fantastic...BUT.....if the project title happens to change in the middle of the project and I edit the text values in the property tab manager I've discovered that when I open an existing drawing those fields (project title in this case) does not update in the title block. Is there something I can do to have this update. I'm almost certain that the answer is no but I had to ask.

An alternate way for me to achieve this is to copy/create a format for each project with that information embedded in it. Not a good option but it is an option. I could also make those fields blank and they could enter it upon creating each drawing but that's rediculou since it's the same information each time.

Any insight would be much appreciated!

SolidworksDrawings And Detailing