Linux上的菜单和子菜单脚本

There is 2 things i'm not sure about which i have been trying to do for a while and i'm sorry for sounding stupid, but i'm not sure where to integrate the code so that when option A or B is pressed in the Sub Menus it says "Option A Selected" I'm also not sure how to loop the Sub Headings so that when it has said "Option A/B Selected" it goes back to the sub menu screen. Until i Press the back to main menu button when it will go to the Main Menu. I'd much appreciate any help as i am new to this and struggling with this bit in particular, Thanks!There is 2 things i'm not sure about which i ha