I see a lot of people confuse the need for multi variant products. This is good for e.g. T-shirts that have e.g. the same price over all sizes and colors with a lot of the same properties.

What you are asking here is putting some properties on a product and doing some analysis on it. Two things you could use already is the category of the product and the analytic account of the product, but these are not many2many. (with many2many your total sales would not be correct in your Sales Analysis if you want to group)

I can not tell you immediately what the easiest solution would be. A possible solution is using the technical features to add a many2many tags field on a product, put a related/function field on the sales order line and then create a view of the salesorder line where you have the amount on the line and you can sum it. Or by programming you could add it in the sales analysis and you could filter on it. (latter is not much work at all, but not in the standard version)