what is the data storage ability of custom objects?

Summary: Hi, We need to store charge data against each transaction line. Around 500 different charge data against each transaction line will have to be stored in the cloud. We are planning to create custom object to hold the charge data and attach it to the AR transaction lines. Custom object is going to have around 200 columns to represent the charge data and around 500 lines of custom objects will be associated with one single AR transaction line and each transaction can have around 200 transaction lines. We want to understand whether we can achieve this with the