KP is right, as it stands you are operating under the standard by-laws which means that the two of you are responsible for the common property collectively. Having something in minutes doesn’t achieve anything, you need to resolve to pass by-laws and register those by-laws with the Department of Lands.
Also agree with KP’s advice that you should consult a lawyer. If you want to make each owner responsible for specific parts of the property, then you need to determine what they are, and that needs to be spelt out in the by-laws, because what you are doing or would like to do is giving each other exclusive use. That is not as easy as it sounds.