【求助】工存圖中如何做對稱結構的中心線！

oh my gud!!
my english is very poor!!!
i don't see your

明明是中国人却不说中国话,喜欢乱放洋屁,TMD真叫人恶心!

HELLOW BOBY:
   THANK YOU VERY MUCH FOR ONE QUESTION FOR!
    BUT I HAVE ANOTHER A QUESTION:
       HOW TO CONTROL DIMENSION LINE AND DIMENSION TEXT COLOR INDIVIDUALLY
    THANKS!