How to save multiple form entries to one line

I currently have a form that saves data to another database but I’d like it to save data to specific clients.

For example, Client A has their information displayed on the page, I want to add notes to their profile. I see the client multiple times per day so I would need to keep adding notes and have them displayed on the same page but I want them all saved seperately and displayed.

I have one profile page to display the clients information and hosts many different clients. On this page is a form to add the notes and under that is a history with a repeating group. How can I add notes and have them displayed without adding a few hundred different lines to the same database. Should I use another database where that forms saves separately and link it somehow? Or should I do it some other way?

A simple step by step would be appreciated but not necessary. All help is appreciated!

I have the same need