Marked blocks can not only be moved, but can be copied (Ctrl+c) and inserted (Ctrl+v) at the play-head position, anywhere in your project. You can also delete (DEL) marked blocks. It is recommended that you use the magnification settings, to find the magnification, that gives you the best view of your project. Since 1.2, LMMS has a 12.5% magnification, that allows you to see 350 bars of your project!