Can I add more lines for more categories?

At this time, the amount of custom categories are limited.  Please use a category that is high-level and can be a catch-all for multiple expenses for now.  EX: Kids sports could just be listed as Kids - then you can also have kids clothes, school supplies, parties, etc. in that "Kids" category.

If you insert rows, this will cause formula errors on other pages, such as the Annual Overview tab.