The global restrictions can be overridden on the single product.
Edit the product and open the “Minimum Maximum Quantity” section.
If you don’t want to apply any quantity restriction on the product, enable “Exclude Product”.
Otherwise, enable “Override product restrictions” and insert the required values that will be applied to the product overriding the global ones.
You can configure the amount limits for each single variation of the variable products.
Follow these steps:
Go to the product, select the tab Minimum Maximum Quantity and enable the Override product restrictions and Enable variation restrictions entries.
Now you can set different quantity values for each variation.