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2015年：用公司A的140拿到I 485

2016年：换到公司B，重新开始办140

2017年11月：拿到公司B 140 approval

2017年12月：离开公司

2018年2月：可以向移民局申请link 485到公司B的140吗？-No. The I-1`40 is void due to your leaving B company.

还是需要等到180填后（2018年5月）才能申请link？

还是完全不能link？-Right. But because your I-485 had been pending for > 180 days during your working for A company, your I-485 is still valid. So, as long as you can find a new job now  in the same/similar field as your work for A company, your I-485 will be approved.  You just need to ask your new employer to file Form I-485 Supplement J when you file a new job, not need to file a new PERM/I-140.

I had answered your same type of questions many times before, so please check my previous answers and also please do not ask the same type questions again.

谢谢