@ Chip Bennet
Thanks for your response.
Now with hindsight I realize the ambiguity of my question.
But first a clarification. I’ve not modified existing page templates, only added templates based on existing templates. These new templates have been added to the theme folder. I made the assumption that storing additional page templates in the main theme folder was appropriate but based on your comments perhaps additional templates should always go in a child theme?
I’m just learning about child themes – only because I wanted to load different Javascripts to different pages. If I understand correctly this creates a problem because when WP upgrades it will overwrite the theme returning the theme files to the original state and hence the changes to header, where I placed links to the scripts would be lost – but perhaps I misunderstood and this only happens if the theme is upgraded?
Anyway if my assumption is correct then I was wondering if the process of updating WP would erase any new page templates that were added to the theme file. Or does this only occur when you update a theme?
Another reason I ask is that I’m about to upgrade WP to 3.1 and even though a backup would save me I would like to anticipate any changes I need to make with regard to where to locate the page templates.
Thanks.