YITH Request a Quote for WooCommerce allows enabling an easy-to-use system to manage quotes and price estimates. Your users can add one or more product to the quote list and send a request. The admin can, then, make a custom price and send the quote (email and PDF document as well): if the users accept the quote, they will be directly taken to the checkout and to purchase the selected products at the agreed price.
The integration with YITH Compare allows you to show the “Add to Quote” button also on the products displayed on the Compare list, so, requesting a quote will be as easy as pie.
To enable this integration, just make sure you have installed and activated the premium version of both plugins.
Then go to the YITH > Compare > Comparison table and flag the option called Show “Request a Quote” button in product info.
This is what it will look like in the comparison table:

For further details about the YITH Request a Quote configuration, please, refer to the official documentation.