Follow below Steps to deploy a suiletscript in Netsuite
Go to -> Customization -> Scripting -> Scripts -> New
Click choose file then save.
Click Create Script Record.
You will be directed to a script record screen.
Fill Name and ID as given in above image and click save
After saving deploy script button will appear, now our script is ready to deploy
Click Deploy Script Button.
Fill the deployment record details like name , id , Audience, Status as Released etc.
Now our suitelet is deployed
Click on link to verify