Copy values of cell into another cell using algebra to define the destiation cell

Hi everyone

I am making a quoting document and I need to create a macro to run from a button which will "save" values from an "item selection form" worksheet into a "quote summary" sheet. I can write a code which will do this to a set location but my problem is that the location where the values need to be saved will change depending on the value in cell "C16", which signifies the item number. The save location needs to be Column: A, Row: (C16+3) in order to cater for a large number of parts to show up on the "quote summary". If someone could just explain how to code the reference to the cell I think I could work the rest out from there, it would be a massive help.

Thanks,
Glen