Bundle Price means bundling all the product prices in the selling cart into one single product price. Bundle Price usually happens when a Customer wants to make all the product prices on 1 customer invoice become 1 price from only 1 product.
To make you able to Bundle the Price, make sure your user's group role "BundlePrice" is activated just like in the picture below.
I. Bundling Price through Sell Menu
Step 1. Right-click on an item and choose Bundle price.
Step 2. Then do the payment as usual sales transactions. The unit price will be bundled automatically, the total price will be set to one product price
Step 3. Once the transaction is complete, you have created the invoice with the bundled price
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You can also sell using merged price. You can read this article to sell products with a merged price: Sell with Merge Price
You can hide the selling price for products. To hide the selling price, you can see this article: Price Visible Restriction
If you have delivery fees on your store, you can also make the selling price can be customized for that product only. To make a custom price for delivery fees product, you can read this article: Custom Price for Delivery Fees Product