Select the note bars in the editor and just drag them. With snap to grid off you can drag them wherever you want. Or you can make a macro, it's kind of tedious to set up and uses a ton of undoes (unless they changed it), that will move the notes for you by milliseconds( which is great for offsetting note delays like 60ms for staccato and 120 for legato on the same track) But i think it works one ms at a time. So, if you go that route, I would start creating the macro and save it. Then open it in a text editor, if I remember correctly it's an xml file, and copy/ paste all the 1 ms moves so that it goes by faster.
I'm not sure if I misread your question... If you mean edit the end/ beginning of notes, turn off snap to grid, select the notes you want to edit and grab the end of one of them and drag it. It will change the note length of all selected notes.