One option to add licenses is to have an import via a CSV file.
This could be your option of adding a bulk license import if you have your license information already in a SAM tool or some other database where you have the option to export and design what values you want to have in your exported CSV file.
Please download the template file. Check how you can export your license information in a format of that template.
Note we can design templates for you that your CSV imports matches the software license information we need to transfer your licenses and that we use your existing license information.