Hi @paulbarrett1952,
WPC Grouped Products is a plugin for grouping separate products together. Customers can choose to add only 1, some certain items, or all from a product group to the cart. All items in a group are still treated as INDIVIDUAL items. Noticeable, Grouped Products doesn’t have any discounting method. Users CAN’T control the chosen quantity of grouped items as well. The only way to give a discount to a group is to use the coupons or vouchers.
For your purpose, you can try to set up the plugin: WPC Product Bundles
WPC Product Bundles is a plugin for bundling simple, subscription, and variable products. Customers must buy all items included in a bundle to enjoy the promotion/discount. There are 2 pricing methods: fixed price (General tab) or auto-calculated price (the sum of prices of all chosen bundled products). Customers can change the quantity of each item when the Custom quantity option is enabled and can leave any item out of the list if you set the Min quantity limit for each item to 0. This is the most flexible and common plugin for building offers like yours. You can check one example here, this bundle is made of different variations of the same variable product: https://doc.wpclever.net/woosb/bundle-samples/. Doc: https://doc.wpclever.net/woosb/ Live demo: https://demo.wpclever.net/woosb/
We also have another plugin called WPC Composite Products for WooCommerce, which is a kit-building plugin. In a deal, you can set up both optional and required items, with flexible pricing methods: only base price, include/exclude base price. You can rename a component and set a new price in percentage or use an amount. Users can add multiple products to each component, but only 1 item can be selected from the list for each component. There are a variety of sources for users to pull various products at once to each components using product tags, categories, attributes (color, size, …), brands, etc. Doc: https://doc.wpclever.net/wooco/ Live demo: https://demo.wpclever.net/wooco/
Regards,