how do you change/personalize the samples of Beat Designer? could I load my own samples?
Beat Designer is a MIDI pattern generator. It has no samples but drives the sample triggering in an instrument. It’s pretty common for a drum instrument (Groove Agent SE, for example) to allow you to change or load pad sounds.
So the answer to your question is a qualified ‘yes’ based on your perceived intention.
Check out the plugin reference manual for info on Beat Designer. There’s also a dedicated manual for Groove Agent SE.
Good stuff on YouTube as well. For example https://youtu.be/_N5YnjbmhKk.