Attributes price value

Hi.
I wonder if there is anyone out ther who have the same issue that i have.
I have a wide range of variations when it comes to attributes. I would like to make this easier to handle. Like:
base product,lets say a t-shirt cost i.e.:
$10 for a basic t-shirt.
if i want to ad colours that has a value of $2 it would ad that price to base product. $10 + $2 = $12 total.
This is no problem as long there is 1 attribute involved.. but if i need more. Say that i want to ad additional print on my t-shirt. This attribute could have a value of $4.
I could then choose
base t-shirt $10
Colour $2
print $4
$10+$2+$4=$16 total.. What im struggeling with is that if price on core/base-product, in this case a t-shirt, changes… i have to change every variations of that product.