The employer can file its I-140 petition based on certified PERM if it believes that it will employ you on an indefinite basis in the future, i.e., when you receive your green card.
The priority date of an I-140 petition can be ported if Employer B starts the GC process from the beginning through the filing of PERM. In addition, Employer B can file H1B petitions requesting extension of status beyond 6 years in 3 year increments based on an approved I-140 petition through any employer. Consult with your current immigration attorney for case specific advice.
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They can proceed with the I-140 to the extent they intend to offer you permanent employment. "Porting" works after an application for adjustment of status is filed and has been pending at least 6 months, provided certain conditions, not apparent here, are met.
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