Smarty Modification For The Whole Site

Hello there,

I have to do some if/else product_id smarty changes,
that I need to be persistent over the whole site.

I've managed to get it to work from the /bright_theme/templates/index.tpl
but i was wondering if there is another way to apply this, so it stays after the cs-cart updates?

Thank you :)

if I understand you correctly, you can override the index.tpl template with the My changes module