Best way to update footer with book version #

[slang75]

Hi all,

I have a book and that book has a version number, 4.0. This number is on the cover page, and in the footer of the document as well. What I would like to do is have that version number in the footer update whenever I change the version number on the cover page.
What is the best way to do this? Cross-reference or variable? I just don't want to have to update the footer everytime the version number changes?

Any ideas?

Thanks!

[FieryPantone]

1. Define a user variable in your cover page

2. Update a representative file to use this variable in the footer

3. Use File > Import > Formats, selecting only Page layouts and Variable definitions, to update the layout and variables for all the documents you need to manage.
] Take care if some documents already use variables with document-specific values you don't want to overwrite

4. When you need to change the version number on the cover page, update the variable in that file and repeat step 3 (this time with only Variable definitions selected) to apply the update to all the component files