It's pretty easy to do on a PC. Go to the Documents\My Games\FFXIV folder, open the CHAR folder for your character, copy all the UI dat files such as macros and hotbars, then go back and open the CHAR folder for the new character and paste them in.

If you don't know which CHAR folder is for which character, the only ways I can suggest figuring it out are to look at the created by and modified at dates, and open the log folder to see when the logs were last modified. The logs are of your chatbox, so if they were last modified today and you logged in today, it is a character you logged into today. Your main character will have a huge amount of these log files too.