i want to get user input like this

please tell which option to chose
1. mango 2. tango 3. rango

if user chooses mango

then it should execute a set of statements and again ask like this

what do you want to do
1.add 2.subtract 3.exit

when i choose exit it should goto my previous menu asking again (please tell which option to chose
1. mango 2. tango 3. rango )

i have did coding to an extent like this

Code:

#!/usr/bin/ksh
#

echo -e -n "choose names as listed in the below format 1. mango 2. tango 3. rango 4.exit"
read answer
echo "$answer"

while true
do
   case $answer in
   mango) DT=$(date)
   echo "******************* $DT ***********************" 
   echo -e "Specify what options 1.add 2.subtract 3.exit"
   read input
   #
   if [ "add" = "$input" ]
   then
         echo "add"
   elif [ "exit" = "$input" ]
   then
        exit 0;;          
                        #iam getting error at the place exit 0;;
   elif [ "subtract" = "$input" ]
           echo "sub"
   else
           echo "!! must specify add or subtract"
   fi
 
   #
   tango) echo "tango"
   break;;
   #
   rango) echo "rango"
   break;;
   exit) exit 0;
   break;;
   #
   *) echo "please enter correct value" read ;;
   break;;
   # --- VBE --- adding missing done...--- #
done

As you can see first it will ask me to choose from 6 options
1. mango 2. tango 3. rango 4.exit

. If for example if i chose 1. mango
then it will ask
1.add 2.subtract 3.exit
now if i chose exit . it should go back to main menu (THIS IS WHAT IAM NOT ABLE TO DO) and ask
1. mango 2. tango 3. rango 4.exit
if i give exit here then only script should exit.

Please help how to do this one in the existing scrit. if not possible then modify and do in whicvere way u wish to do to to get the final result. I have just put an skeleton overview of the script. If anyone have any better approach on this then please advice as to how to arrive to this solution.

Moderator's Comments:

Please use next time code tags for your code and data