How To Create Custom Fields in Supplier Response Screen of an RFQ using Sandbox

Summary:

We have a Business Requirement where we should enable/create custom fields in RFQ Response Screen at the lines in the Supplier Portal for an RFQ, so that Customer can input their responses like Country of Origin, Lead Time in Days, MOQ, etc.

This we need in the Reponse Line level.

Since DFF is not Supported in RFQ Response Lines, is there a way to create custom fields using Sandbox?

If we can create, is there a way for import functionality since there will 100s of lines?

Please Guide.

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