Currently in Retroarch multi-patching requires hardpatching multiple times, then generating a new patch for softpatching via comparison between the two copies. This isn't optimal, especially in situations where only one patch frequently needs updates.

It seems a standard already exists in snes9x standalone for file naming for multiple ips patches (snes9xgit/snes9x#217 (comment)). I'd simply request the same functionality as is listed in steps 8-10 of that comment be added to Retroarch. Having glanced through the source, it doesn't seem this functionality exists in any manner currently.