Imagine that I sell sofa beds. One specific product comes in 4 different sizes and 2 different types of mattresses. That makes 8 variations.
There are also 14 fabrics to choose from. The fabrics can be grouped into 3 price levels.
How do I use the fabric price level to select variation, and still let the user to choose specific fabric?

If I use each individual fabric as variation selector there will be 112 variations, that is just not manageable.