I'm not expert, but here's what works for me...
In File Explorer, I copy the .lua script. I add 01, 02, 03 to the end of the name (or something more meaningful).
Then In OBS, I click the plus sign to add the copied scripts as needed. You can configure each one independently because they are separate scripts.
For example, I have multiple copies of the CountdownDays.lua script in my scripts folder. Each one is configured to countdown a different number of minutes so I don't have to set the timer when I want to run it for a different countdown.
You should probably consider nesting your scenes too. Search OBS Nesting Scenes on YouTube to learn more.
I hope that helps.