How to manager different projects with similar code?

[eluser]jaswinder_rana[/eluser]
Thanks for the elaborated answer. It was helpful. I understand now the reason to not update old projects. I can now see the headache when things break in a nicely working project; clients won't be happy.

If someday you decide to release your code as Open Source Project then please let me know. I am very much interested to see how you do it.