How to make Quantity not required in RFI negotiation

Summary:

Dears,
How to make Quantity not required in RFI negotiation.
We use RFP,RFQ and RFI.
I cant make it all time not required, the exception is in case of RFI.
Is there any code in need to write and where to write.

Your support is highly appreciated.

Best Regards,

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