Button to add a new child row related to current parent

[Bulubulu]

Hi,

I'm trying to create a button in the parent view to add a new child referencing the current parent.

For example :

I have a "Project" table as parent and a "Comment" table as child. When navigating through the details of a project, I would like to be able to add a comment and automatically set the current project as the reference.

Could you please help me with this newbie question?

Thanks and have a nice day !