Page Third Party Mesh Combination Tools1

There are a few mesh combination tools available on the Asset Store. I would highly recommend checking out either of the following. They provide alternatives to Unity’s mesh baking. Both support non-destructive mesh combine functionality, and are great alternatives.

Mesh Combine Studio 2

https://assetstore.unity.com/packages/tools/modeling/mesh-combine-studio-2-101956

Advanced Merger Toolkit

https://assetstore.unity.com/packages/tools/modeling/advanced-merger-toolkit-129869

I have used this package for a number of projects personally and really like how it handles the process.