how modified the price od product and domains on buy cart (step 4)?

Hi of all of you,

I want to modified the prices of the products that are on the cart buy on step four,

I want to do this because the price will be modified depending of the client.

then, I was researching if a hook could help me so I found the order hooks like PreCalculateCartTotals within hook I tested modified the price but this dosn't change on the order.


So, i need to some ideas to can do this.

Somebody can help me with it?

Regads.