Creating channel depending on two channel values

Hi,

I have got two channels, for the sake of simplicity lets call them x (1 to 10 with increments of 1) and y(20 to 30 with increments of 1) with the same length.

What I would like to do is to go through channel x, look what at each instant corresponding value of channel y is and depending on that multiply channel x with factor and create new channel with this results. 

I was thinking that the easiest way would be to create table in excel, but then I am lost in how to script it in DIAdem to be able to read the table and get the result. 

Any idea would be very helpful.