Yes, you can add subtitles (text) to the same location.
‘Copy text layer’ is available on GOM Mix Pro.
Please refer to below instructions.
[ How to use the text layer copy feature ]
1. Click on the ‘Copy layer’ button.
A layer with the same format will be copied as below.
2. Move the copied layer to the desired position.
You can modify subtitles (text) by clicking the ‘Edit’ button.