Topic / Category Template

Hi,

I wanted to have a special rendering for single pages of a certain category, so I extended the index.php of this theme.

This works great. Now I would like to reuse the same code for the category-9.php file (given ID=9 of that category).

Would it be possible to move the whole code to category-9.php and include it somehow from the index.php? Have not found anything about this...

thanks