Products with Variances

It seems to me that a very fundemental function/feature is missing from Aronium. When adding a product, there is no option to add variances for this product with different size/price/etc.. 

So for example, you add a product called "Salad", but you offer this product in 3 different sizes. It seems to me that it's very unecessary and confusing to have to add 3 separate products with all different sizes. Instead you should be able to add a product and add variances of this product, for example Size, Price per size, etc. 

Also, each variance should have options you can attach to that variance, for example, if you select "Salad", you should have an option to add the different sizes and than you should have the option to add different 'add-on' products to each product size. I have provided some examples from a different system. I believe this feature is honestly FUNDEMENTAL and every POS should have these options.