Hi there,
Welcome to our forum and thank you for contacting us with your question!
Since you haven't provided any kind of picture or code, I'm not sure what you want to acheive. But I would suggest to study topic in the link below, cause that might be what you actually are looking for.
Topic: viewtopic.php?f=9&t=48767
Or take a look at this official demo, maybe you will find it helpful:
https://www.highcharts.com/demo/column-negative
Let me know if that's what you were looking for!
Best regards