How we can add a question or inquiry stage for the supplier with expiry/deadline ?

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As all RFP Contains a limited time period for questions and inquiries from suppliers :

We have a requirement where we need to submit an RFP to suppliers and we need to add a step/stage where all questions/inquiries can be received from suppliers?

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This stage/step can be for a limited time period as usually follow in any RFP Process?

Your help is much appreciated