Import Sequence using csv

Hello.
I am trying to have companies’ sequences in a csv in order to import it easily.
I’ve succeeded in exporting / importing a custom « base_sequence ». And it appears on my server.
But company « custInvSequence » isn’t set after importing it. And this « One to many » field doesn’t find those sequences.
Could you please tell me how to proceed in order to import sequence to directly appear in company’s « custInvSequence » field?
Thank you