How to edit bed comfort etc?

So I noticed that in some of the creators maxed out the numbers on the mattresses they have separated from the frames. I want the original numbers. I personally can't make head or tails out of the mattress separation tutorial. So I can't do that myself. The most I can do is recolor things. I figure changing the numbers would be simpler. I figured out how to adjust the cost of items but not the comfort. How do you change the numbers?