Creating a Custom Post as a repository for theme constants

I was wondering if it would be possible to create a custom post with different custom fields so that if a download document used in many pages changes the user can come here to update the name.
In other words, if the document sitting in www.web.com/uploads/catalog2012.pdf is upgraded to catalog2013.pdf, the user would be able to change the document name here.

Thanks in Advance,

Mauro

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