This might be a duplicate but after countless search I couldn't find anything that matches my needs.
Sometimes a picture speaks better than words, so here is what I'd like to achieve in Qgis. I guess there is a processing tools doing exactly what I'd like but I couldn't find it.
It is also very important that they do not get merged duting the process and that they keep their original attributes since I need to work with them afterwards !
I am a beginner in GIS software.