Change the styles in the first template that you create, then use that template as the basis for the others.

Another approach that means less work when something changes, but more work from the start, is to create one template and use macros in that template to make the changes to that template for each document type. This works better when all the templates are basically the same, but have different standard fixed texts etc.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com