Sahebal...
I wish I had some answer that would put you on the right track, but I may have used more than one Partition Manager to get the job done. My feeling is that you need help using partition managers more than a reference to a particular one. It would be complicated and perhaps impossible for me to tell you how to use any partition manager (on-line) in a way that would help you more than just get you into more difficulties and perhaps make your system unusable altogether. If you can find someone who can actually show you (in person) how to do the things I have suggested it would probably be the best situation. Poor instruction {from me on line) could be the worst that could happen, even worse than the situation you have now...
Try to find someone to be a tutor in the use of a partition manager. They are not all the same , some PMs are more useful than others, but they are not all that intuitive in their use and can do serious damage to your OS if make a mistake....
Regards,
William