Can we set the env variable for 'specific tool' to use any of the specific sub tools. To use specific sub tool it should point to the 'installation' folder of the that sub tool installation directory and to use another specific subtool it needs to be set to 'installation' folder of the another sub tool installation directory.
Yes you definitely can set 2 environment variable sin one file.
set <VAR1> <value>
set <VAR2> <value>
If you are using perl then $ENV{'VAR1'} is how you call the environment variable.
You can also use system commands in your script or backtick to set env.
For ex : system "setenv VAR1 value"
echo $VAR1
Also, `setenv VAR1 value`