I've just opened a new store that I am setting this up for an organisation that only wants to sell their official clothing in certain colours. They want to offer a men's t-shirt and a men's hoodie in a particular colour and only have those two products available. How do I do that? They have several types of "bestsellins" t-shirts and hoodies appearing on site, but I only want the basic, cheap ones there. And how do I select the specific colour I need? There used to be like 24 colours, now there's only 12, which aren't the ones I need.

I have an older store that uses the manual creation method which makes this easy. How can I do this now?