Yes, you can configure Purchase Requests in Odoo independent of PO and Inventory, with the following approach:

 Option 1: Use the “Purchase Request” Module (Add-on)

Install purchase_request (community modules or from Odoo App Store).

• Allows users to submit internal requests.
• Can be approved/rejected by managers.
• Does not require PO or inventory actions unless configured.
• Can be extended for budgeting, finance, or service workflows.

 Option 2: Custom Workflow with Approvals

Use Odoo Studio or custom module to:

• Add a Purchase Request model (purchase.request) with fields like item, amount, justification, etc.
• Add approval stages and responsible users.
• Use Automated Actions to notify or escalate without PO creation.

yes, Purchase Request in this case is Request for Quotation that not become a Purchase Order