Extension of driving licence A1 ?

Hello friends, I hope I’m writing here in the right forum. I made my A1 driver’s license at 18 at that time. Now I am 29 and would like to drive a big machine and hold the A driver’s license. In the past it was so that you could expand a1. Would that still go today? So that you don’t need many theory hours and driving hours. Does there know what more to do now? And maybe what would that cost about? I know every driving school is other but maybe one knows. Would I be happy about help / enlightenment Greetings Tobi