How to track the same properties to multiple events

Hi team,

I’ve come across this topic about the Property Group

https://help.amplitude.com/hc/en-us/articles/5078762828699-Streamline-property-updates-with-property-groups

The article mentioned how to create (in the Amplitude console) and add them to an Event which is the use case that I’m looking for. 

But I still wonder that don’t we need to add those properties in the code before ? Can we just put one line of code and apply to several selected events ?  

Let me give some examples of my use case,

So I’m working on a bank app for my client, they would like to know the status of user during the first step until they convert - open an account. The user status consist of a member to the bank or non member. Due to this I think we need to add the user status to every event in the open account journey.

Property Group is suitable for my case, I guess. So I would like to find out the way to implement the property in this case in more detail.