My screen is cracked and working partially.

Replacing the LCD panel on a Dell laptop is not easy. There's a whole bunch of screws that have to be removed in order to replace the LCD. Be sure you shop around, because LCD panels for laptops can be expensive, and in some cases, can cost almost as much as the computer itself. I learned that the hard way when I spent $600 for a new LCD panel for my Inspiron 8600! (the system died soon after replacement). So depending on the age of your laptop, I wouldn't bother replacing the panel. Just purchase a new laptop, which would be much cheaper and you'll probably get more powerful hardware (don't spend less than $1,500, though). So my recommendation is to shop online for your LCD panel, or purchase a new laptop. I have a Vostro 1400, and already there's a yellow line going down the screen. I'm not going to get a new panel, since the laptop is over 3 years old. Good luck!!

You cannot fix cracked screen, it has to be replaced.

Probably can find cheap on eBay.

Screen removal instructions published in service manuals for Dell laptops at Laptop Manuals Hub

Find your manual and follow the instructions.

Yes for sure you can and as it is cracked then there would be no option apart from replacing it. You can easily replace it by yourself if you are confident about your technical skills and order the new screen online the replace it by following the youtube tutorials.