Configuration:
Guitar Pro 7.6 for Windows OS and macOS X
Steps:
Guitar Pro 7.6 handles up to 4 voices for a same track. It allows you for instance to edit notes of different values on the same beat.
You can access and enable the Multivoice feature in Guitar Pro 7.6 from the Edition Palet located on the left of your window, or even access it from the Edit > Voices menu.