From your post and location you seem to be in Karachi and want to run the car there. However if you were in Bahawalpur, I could have put you in touch with an "agent" who shouls have been to help you out, but, as usual, there is always a "fee" involved. I have no idea how to work this out in Karachi. Maybe you need to make a trip to the Civic Center and make enquiries. There are lots of "agents" roaming about that could help. If you are thinking of re-registering the car in Karachi, that is a bit complicated. As far as I know, there is a NOC involved from the Punjab Excise and Taxation dept. But since the car is on open letter, that might be a bit difficult. My advice is to fix the paperwork from Bahawalpur with the car in your name and all the back taxes paid, you can then look at the possibility of getting a Karachi number for it. Though I live in Isloo and drive Bahawalpur registered cars here but I pay the Bahawalpur registration taxes in Bahawalpur. Doing so keeps things straight forward.