The Variant Bulk Order block enables you to provide your customers a smooth experience, allowing them to order variants in bulk in a more efficient and clean way. You can add this block in the product section of the product template and the featured product section of the theme.

You can see all variants of the above product can be ordered in bulk.
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Here's a tutorial on how you can add this block in the product section:

You can customize this block further, you will find some cusotmization options after clicking the block:

You can simply navigate to collections template > click on collection section settings and enable it:

Here's a video on how you can enable the feature on collection pages.