A shortcut is the same as a single step macro. If you create a macro called "ALL OFF" you want to reference in many places simply do the following.
Create the button in the new location, click record, navigate to your "ALL OFF" macro and select it. Click save and you're done. Now the macro on that button references the "ALL OFF" macro.
I use these all the time on the MX-900 and TX-1000 and it accomplishes the same thing as a shortcut.
There are 10 types of people in this world, There are those who understand binary, and those who don't!