If you need a preset bundle quantity selector for your Shopify store, instead of the normal quantity input box, you can activate the bundle quantity feature (drop-down/select). This feature is available in the “Professional” package.

To get the feature, install the "MultiVariants - Bulk Order" app in your Shopify store and  follow the procedure:

>>From your MultiVariants dashboard, Click on  “Set Rules”.

>>Scroll down then you will see the option “Would You Like A Bundle Quantity Option”

>>Select ‘Yes’ to activate the feature.

>>Enter your quantity input and click on the “+” icon to enter the next value.

>>Set the Quantity in the quantity box as per your requirement.

>>Save the settings and see the change on the product page.