one downside to the Global Data method is that many (most?) technicians aren't familiar with it - so they usually can't figure out where the data is coming from - and what's making it move ...
specifically, there won't be anything in the Ladder Logic code showing how the transfer gets made ...
if that might be a consideration for your system, then post again and we'll cover how to set up an MSG (Message) instruction ... at least that way there'll be a "logic trail" to help track down the data transfer ...