Adding a "New Note Button"
Trying to make a button to add a "New Blank Note file" inside my portal record.
I think you're gonna need to give us more information.
In general if you have enabled "Allow creation of records in this table via this relationship" in the relationship graph for the relationship that links the host layout with the portal table, then all you have to do to create a record in the portal is click on the line below the last record and enter some data.
If you would rather use a button you can set it to execute a script that goes to the last portal row and creates a new record.
Retrieving data ...