Labeling on the surfaces

X1 & x2 indicates main whole pieces and it have sub pieces as shown in the image . im trying to label the sub pieces with a sequence of (AA), (BB), (CC) to again (AA), like a loop. to acheieve points for labeling i used tween curve and i trimed the tween curve at start and end of the curve , then i took the points of the both ends of tween curve , then i generated labeling, but im facing few difficulties , could you please take a look

labeling (38.9 KB)

this are progress files , could you please take a look