Variable Product – Each Variation to add a flat rate price?

Hi!

I’m looking at adding some product packages to my website that have a lot of different addons / variables.

I’m hoping there’s some way of having each variant of the product to just ‘add’ a cost onto the base price rather than having to make a price for each individual variant.

For example:
With some staging you can choose different heights, and with that there are different height steps. I’m wanting the next height up from standard to add ￡20 to the base price, and the size up from there to add ￡40 to the base price; with the addition of stairs I’d like that to add ￡140 on TOP OF the extra price for the heights.

I’d be happy to clarify further if needed as I feel I’ve not done a great job!