[Ulzgoroth]

Link doesn't do it, Linked effects deal with DR separately.

Followup is the closest thing, but it's sequential and even there not cumulative for penetration.

What you want...frankly isn't well defined. The two different attacks can face different DRs and have different wounding types. There's no right way to resolve an attack doing, say, 7 cutting + 3 corrosive.