I am a medical research scientist and I have several U.S. patents. I want to file EB1-Extraordinary Ability (EB-1A) and National Interest Waiver applications (NIW) at the same time with the help of your DIY packages. 

If one of my Form I-140 application gets approved, what would happen with the other pending form I-140 petition? do I have to withdraw the pending I-140 application?

If one of your form I-140 application has been approved, you do not need to withdraw the other pending Form I-140 application. You should keep your EB-1A and NIW application intact, until you receive a Green Card after you file adjustment of status application by using Form I-485. 

The approved I-140 petition cannot be transferred to other, and the I-485 application approval will take one immigrant visa number form the immigrant quota.