I am creating a project, where I am using Heading 1 for my main titles and then heading 2 for sub titles etc. I am trying to use the numbering style for my sub titles, but I cannot get the numbering to work properly. For example my page looks like this

Chapter 1 Intro
1.1 Project Description
1.2 Background
1.3 Conclusion

Chapter 2 Research
1.4 Research on this
1.5 Research on that
1.6 Research on both

How can I get it so it numbers it correctly, so instead of the above it looks like

Chapter 1 Intro
1.1 Project Description
1.2 Background
1.3 Conclusion

Chapter 2 Research
2.1 Research on this
2.2 Research on that
2.3 Research on both