How to organize categories in Ruby on Rails?

Question

Ruby on Rails

Guys please tell me. There is a task to make a small project such as accounting for income and expenses with the ability to add and delete them. It should also be possible to add and delete categories of expenses and income. Therefore, the question is: How best to organize the Categories themselves? Create a global category Category, and then inherit from it the categories IncomeCategory and ExpenseCategory, and then just access them through type? Or is it better? Please advise how such a project can be planned. Thanks in advance.