The answer is no! Depending on your project, you can create as many new captions as you want on the Subtitle Generator Editor.
There are two ways to create new captions :
Decide where you would like to create a new caption and then hit the Enter button on your keyboard and the caption will appear below.
Alternatively, scroll over the grey line between the captions and you will see two small buttons appear. Click on the ' + ' button to create a new caption.