how to import a file in other file between middle of the code

generally:
imports are static (only down once) and as such should be at the top of the script.
especially in this case, where you force a re-import (I guess since you are working in the Sikuli IDE on both modules in parallel).

so this is better in any case:

#######Main.sikuli
import csv
import main
reload(main)
from main import *

if ((scnName == "general") & (stpTest == "STP-GPSBL-002")): #checking the condition
    print "Done"
    startMstsc(1)
    try:
        startApp(1)
        onAppear("7Connected.png", handler)
        observe(FOREVER)
        startTest(1)
        stopMstsc(1)

    except FindFailed:
        popup("image not found")
        print "img not found on the screen"

now you are doing an import(main), but I cannot see any main.sikuli.

if I understand your script right then this should be:
import MSTSC_SIM
reload(MSTSC_SIM)
from MSTSC_SIM import *

… or I understand everything completely wrong.

Apologies from my side, You are the right.
I have tried it but I got an error like below:

[error] Error message: Traceback (most recent call last):
 File "C:\DOCUME~1\kartheek.m\LOCALS~1\Temp\sikuli-tmp8900339240024860525.py", line 2, in
 import MSTSC_SIM
 File "C:\Program Files\Sikuli X\sikuli-script.jar\Lib\sikuli\SikuliImporter.py", line 45, in load_module
 File "C:\Program Files\Sikuli X\sikuli-script.jar\Lib\sikuli\SikuliImporter.py", line 29, in _load_module
ImportError: Errors in loading sikuli module: MSTSC_SIM
'with' will become a reserved keyword in Python 2.6 (MSTSC_SIM.py, line 62)
 - HOW TO FIX? Try adding "from sikuli import *" in the module.

and it is showing error on "import MSTSC_SIM"

my updated code is:

#######Main.sikuli
import csv
import MSTSC_SIM
reload(MSTSC_SIM)
from MSTSC_SIM import *

if ((scnName == "general") & (stpTest == "STP-GPSBL-002")): #checking the condition
    print "Done"
    startMstsc(1)
else:
    popup ("complete")

You are using the old Sikuli RC3 and seem to use the with keyword.

In the MSTSC_SIM add at the beginning
from future import with

In this case it is showing error like below,

ImportError: Errors in loading sikuli module: MSTSC_SIM
no viable alternative at input 'with' (MSTSC_SIM.py, line 2)
 - HOW TO FIX? Try adding "from sikuli import *" in the module.

LOL, sorry:

from __future__ import with_statement

Now i got error inside the function call,
i.e
[error] Error message: Traceback (most recent call last):
 File "C:\DOCUME~1\kartheek.m\LOCALS~1\Temp\sikuli-tmp2868521354483321816.py", line 19, in
 startMstsc(1)
 File "D:\Sikuli\test\MSTSC_SIM.sikuli\MSTSC_SIM.py", line 9, in startMstsc
 type('r',KeyModifier.WIN)
NameError: global name 'KeyModifier' is not defined

if you have
from sikuli import *
in your MSTSC_SIM.sikuli

then you might try with the "RC3" approach
from Sikuli.sikuli import *

If this does not help, then you have to check your complete Sikuli setup (mixing versions?)

In my script i have 'from __future__ import with_statement' instead of 'from sikuli import *'

from sikuli import *
is always required in imported modules containing Sikuli features.

I think, I did not tell you to not use it anymore !?

Ok sir, Now is there any alternative for my script. Please help me.

If you have interest I'll send you my scripts, Can you help me

what is the problem left?

You might send the stuff zipped together silently to my mail at https://launchpad.net/~raimund-hocke (top left)

Thank you sir, I sent you the Zip file

Thanks RaiMan, that solved my question.

Thanks a lot.. you did fantastic job... :)