I-129S, Nonimmigrant Petition Based on Blanket L Petition
The supplicant with an approved blanket, L-1 petition can file Form I-129S to specifically allocate a beneficiary, who is outside of the U.S., as a manager or specialized knowledge expertise.
Petitioner (employer) has to file the Form I-129S with Form I-129, Petition for a Nonimmigrant Worker, if the beneficiary (employee) stay in the United States and the petitioner wish to change the status or extend the stay for that beneficiary.