erpnext/erpnext/docs/user/manual/en/buying/request-for-quotation.md

A Request for Quotation is a document that an organization submits to one or more suppliers eliciting quotation for items.

In ERPNext, You can create request for quotation directly by going to:

Buying > Documents > Request for Quotation > New Request for Quotation

Create Request for Quotation:

Create Supplier Quotation from Request for Quotation form: