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As of now (April 2017) I have been using this plugin for about a year on a site selling B2B to set a minimum order number per product and incremental increases in numbers ordered – that is, order a minimum of six of any product and increase by six incrementally – so 6,12,18 etc.
The ability to override that rule for a promotional product is built in to this plugin, as described here:
https://wpbackoffice.com/plugins/woocommerce-incremental-product-quantities/
Excellent plugin.