Bash Back to run script - bash

Question

i want to make an config script.
The main Script starts with "start.sh"
If the Script starts i can choose "install" "update" etc.
Now i want add "Config" and add content like php congigs like upload size....
But how i can go back to the start.sh? I want use parent id but im not sure how i can make it correct.
Start.sh
1.2 > Config
1.3 >> runs php_config.sh"
Now i want go back to "Start.sh" without run "start.sh" again. The vars i change would be written in a file and are global readable from start.sh > installer
Thank oyu
Edit: Sorry for bad quick asking...
i start the start.sh and install dialog and make a menu.
If the user choose "Make 2" i load the file and start the function.
#!/bin/bash
#-------------dialog
apt-get -qq install dialog >/dev/null 2>&1
HEIGHT=30
WIDTH=60
CHOICE_HEIGHT=14
BACKTITLE="How to get back"
TITLE="Back"
MENU="Choose one of the following options:"
OPTIONS=(1 "Make 1"
2 "Make 2"
3 "Make 3")
CHOICE=$(dialog --clear \
--nocancel \
--no-cancel \
--backtitle "$BACKTITLE" \
--title "$TITLE" \
--menu "$MENU" \
$HEIGHT $WIDTH $CHOICE_HEIGHT \
"${OPTIONS[#]}" \
2>&1 >/dev/tty)
clear
case $CHOICE in
1)
# Make 1
;;
1)
# Make 2
source ${SCRIPT_PATH}/menu_php_7_x.sh; php_7_x_config
;;
1)
# Make 3
;;
esac
The menu_php_7_x.sh is like this:
#!/bin/bash
php_7_x_config() {
HEIGHT=30
WIDTH=60
CHOICE_HEIGHT=6
BACKTITLE="config php"
TITLE="Choose php.ini config"
MENU="Choose one of the following options:"
OPTIONS=(1 "Change post_max_size"
2 "Change upload_max_filesize"
3 "Change memory_limit"
)
CHOICE=$(dialog --clear \
--nocancel \
--no-cancel \
--backtitle "$BACKTITLE" \
--title "$TITLE" \
--menu "$MENU" \
$HEIGHT $WIDTH $CHOICE_HEIGHT \
"${OPTIONS[#]}" \
2>&1 >/dev/tty)
clear
case $CHOICE in
1)
CHOICE_HEIGHT=2
MENU="Change post_max_size"
post_max_size=$(dialog --clear \
--backtitle "$BACKTITLE" \
--inputbox "Please Type your post_max_size value:" \
$HEIGHT $WIDTH \
3>&1 1>&2 2>&3 3>&- \
)
;;
2)
CHOICE_HEIGHT=2
MENU="Change upload_max_filesize"
upload_max_filesize=$(dialog --clear \
--backtitle "$BACKTITLE" \
--inputbox "Please Type your upload_max_filesize value:" \
$HEIGHT $WIDTH \
3>&1 1>&2 2>&3 3>&- \
)
;;
3)
CHOICE_HEIGHT=2
MENU="Change memory_limit"
memory_limit=$(dialog --clear \
--backtitle "$BACKTITLE" \
--inputbox "Please Type your memory_limit value:" \
$HEIGHT $WIDTH \
3>&1 1>&2 2>&3 3>&- \
)
;;
esac
# Back to menu
start.sh
}
This is only an example i want make the config with more options and pre selections or the user have choose from selection and have not input a value.
My questions is now how i can go back to the script to let the user runs installation.