Combining Affects

[dayrinni]

I want to combine the affects on 2 items.
For example - Item 1 has an 'addaffect' of +100 hp, and Item 2 has an
'addaffect' of +20 hp. When 'combined' by the player, the new item will have
+120 hp. Is there something in the ROM code that I am missing that does this,
or I have to write one myself? If so, any help would be good.
Thanks