Try this way. copy the "sub kategorie_title_mb" routine to db_utils.pl and paste it under "sub build_select_field" routine. And changed subroutine name "kategorie_title_mb" to "kategorie_title_mb1" in both call statement and subroutine.

If I know links better, I might include site_html_templates somewhere to proper work but now I'm just beginner in both program and links2.

I hope it could help. But I cannot guarantee this is perfect since I'm still beginner.