After you have created the external database, click on File>Import Data and follow the instructions of the wizard.
The wizard enables to match the columns contained in your external database with the graphical objects of the open Badge Studio document and to define one or several reference columns.
Defining one or more reference columns enables to identify a unique person or object in your database, in order to avoid duplicates.
When duplicates are found in the database, Badge Studio offers the possibility to manage them.
If you want to import more than ten (10) columns in the internal database: match 10 columns of the database with 10 graphical objects of the document.
For the remaining columns, do not forget to select them in the advanced properties of the same window.
For more details, you may watch the dedicated How-to video.