In order to add a custom font for your pdf invoices you need to upload your custom font into the folder /assets/blueline/fonts/ with the naming convention of YourFontName-Regular.ttf and a bold version of your font with YourFontName-Bold.ttf.
The system will pick up your fonts automatically and shows them on the Settings -> PDF Templates page. Just select your font and click save.
Please note that only .ttf fonts are supported.
