All Products Page
1. Click the checkboxes for the product you want to be a component of the bundle, then click the "Create Kit" button.
2. A modal pops up, where you can enter the Title (required) and Quantity of the bundle:
3. Exit the modal, with no change made or click the "Create" button in order to create the new bundle as a draft product.
4. The new bundle product will exist as a draft product and you would be able to fill out all of its product details in the single item editor page (or through bulk).
Single Item Editor
The Kit Details section will be accessible by clicking the Show Kit Details link in the General section on item level, similar to the variation modal.
The Kit Details section will be displayed as part of the single item editor for any bundle product: