about updating information

another one of those "not sure how to ask" questions, so I'll just explain my situation.
I create a template and on a layout tab create viewports to look at
information in model space. In this case, title block info.
Now I created 4 drawings with this template, only to realize I have not frozen a layer in viewport.
I of course revise the information on the template, and re-save it.
How do I update the same information in the other 4 drawings?
The possibilities are endless. We have the potential to use 4 different title block templates.
If I add a few layers, create a couple of new dim styles, ect and open an old drawing, none of that infor is there.
Thanks, jojo
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