请教小白兔: EB-2的I-485可以转用到EB-3,或者反之?

Dear Xiao Bai Tu,

How are you doing?

My family applied LC(EB-3) and NIW.

EB-3's 140 was ted Dec.2004,NIW was applied Jul.2006. The both of I-140 are pending now.

Can we apply I-485 based on NIW first,later we switch NIW to EB-3 if NIW meets trouble ?

Does the switch directly,automatically or need to re- I-485?
How to switch?

Thank you very much!

Judie