If you take a look at the example CR-10S configurations in [github.com]
you can see exactly how to do it...
especially important is the lines like
#define STATUS_SCREEN_HOTEND_TEXT_X (E) (38 + (E) * 20)
#define STATUS_SCREEN_BED_TEXT_X (HOTENDS > 1 ? 81 : 73)
Which defines where on the screen to write the text for the hotend and heated bed.
you can see exactly how to do it...
especially important is the lines like
#define STATUS_SCREEN_HOTEND_TEXT_X (E) (38 + (E) * 20)
#define STATUS_SCREEN_BED_TEXT_X (HOTENDS > 1 ? 81 : 73)
Which defines where on the screen to write the text for the hotend and heated bed.
