-You hav eno problem to apply for the Reentry Permit (RP). But if you also want to file N-470 application to preserve residence for naturalization purpose, the company own has to be a US citizen.
If yes, do I need written support from corporate to do that? What kind of written support?
-Both you and the company have to provide the necessary documents to support your N-470 filing. See the Form N-470 instructions for more details.