Hi Leanne,
I think this is not what you need to do.
For products like scissor, you will need to define a minimum on product level, the minimum for categry (currently) sums all products in that category to meet that minimum value, the next release will include a feature that will go like “apply this minimum to 100 products in that category in a single click” this will be released very soon.
As for step, when you define it on category, it doesn’t sum up anything, it applies this step to products in that category, and in the next release the decimal in step will be fixed.
I hope this clarifies more, if you need further help, please contact me at [email protected]
Omar