Hi Yongkil Kim,
My suggestion would be contact your customer, assuming they are the Tier 1 into Stellantis, and request they supply you with the document from the B2B PSA Portal, although I would politely question them as to why this is a requirement being requested from your company as you do not supply direct to Stellantis, only exception would be if you are a directed supplier.
PSA CSR just for your information:
8.3.5.1 Design and development outputs — supplemental Design
FMEA are conducted by the supplier (except for supplier only in charge of the industrialization, only concerned with the process FMEA). The use AIAG/VDA FMEA Handbook is strongly recommended and PSA must be consulted in case of use of any other standard (including former PSA standard) PSA may request action plans even if not absolutely imposed by the standard, as for events with Action Priorities classified as Medium or Low, especially for the highest levels of Severities Whatever the standard applied, the most critical points for Design FMEA and any action plans are managed during exchanges with PSA, using the document 'Design FMEA Report' 01272_06_00006.