[The_Ryujin]

Quick question for the hive mind, is there a RAW way to make an attack that has two diffrent damage types that stack?

For example lets say I want to stat something like a Warhammer 40k power sword using an innate attack that does normal cutting or implying damage but is also surrounded by an enegery field that erodes normal matter so I want it to do an extra +1d corrosive damage which stacks with the cutting/implying damage (note: to avoid confusion and people getting caught up on the power weapon angle; this is just a hypothetical example, I'm not looking to literally recreate a 40k power weapon. I know how easy it is to get side tracked on the fiddly details heh)

And if there isn't a RAW way of doing this, any ideas how to?