echo "\t\t\t 2. Change directory
needs an ending double-quote.

read x }
should be two lines

Filefunctions () {
should not be followed with
amenu () {

You should have only one while true loop for amenu.

You should have only one of each procedure defined. For example, you have PressEnter () defined more than once.

To get a sub-menu to return to your main loop, simply fall out the end of that procedure. If you run my example menu that I posted earlier in this thread, you will see that after the sub-menus have executed, they do not do an exit, return, break or nothing. They just fall out the bottom and control returns to the main loop, which repaints the screen with the main menu.