Hi Jasmine,
Yes, you can achieve your 
desired workflow of using the eCommerce site as a catalogue and allowing
 customers to add items to a quote rather than a cart/pay upfront. You 
can also prevent Odoo from automatically confirming webstore sales or 
creating purchase orders for webstore sales only.
To
 implement these changes, you'll need to do some customization and 
configuration in Odoo. Here's a general outline of the steps involved:
Customize Sales Order Workflow:
- Modify
 the sales order workflow to require manual confirmation before the sale
 is processed. This can be done by customizing the sales order state 
transitions and adding a step for manual confirmation.
- You can do this by creating a custom module or using Odoo's built-in customization features.
Disable Automatic Purchase Order Creation:
- Website
 Sales Order Trigger: Odoo might have a trigger configured to 
automatically create purchase orders when a web store sale occurs.
Product Price Management:
- Zero
 Price Products: Since you want to set the sales price later, it's 
advisable to keep the product prices in Odoo at $0. You can hide product
 prices on the website altogether to manage customer expectations. 
Consider displaying a message indicating quotes are generated upon 
request.
By implementing these changes, allowing 
customers to add items to quotes rather than carts and preventing 
automatic confirmation of webstore sales or creation of purchase orders.
Hope this helps.