Variants With Different Price

Hi. I don't get this variants on products. I have several products with variants, but the variants don't have the same price. The only options to fix this is to add the pricediff in the variantsfields and calulate

but this is very confusing for the customers and a lot of trouble for me. Is there a way to just set the price on the variants and not on the main products?

I tried to follow this ( don't get the addon at all up so I think its with the cs cart already and the table I don't get either.

So ex:

Costumers dont understand the + and - in the price on the variants.

Could it just just say the price