In your case, I feel like creating Workflow might be the easiest option to get started as you don't really want to update JMP table but rather always re-create new table.
Create new workflow
jthi_0-1701779741265.png
Start recording actions
jthi_1-1701779778285.png
Here I have excel opened and I have added new column
jthi_2-1701779822165.png
You can stop recording at this point, as I feel like this is all you need.
Then you can save your workflow and just rerun it to create new table whenever you need one.
-Jarmo