Import Into Level + Combine Meshes

I can’t find the option to combine meshes when using the File / Import Into Level… function.
The option exists in the default FBX Import options and is really useful.
Is there something that I’m missing or is that just a feature of Unreal that doesn’t exist?

Hi there! Well, I’m not 100% sure but i think you can only combine in the default FBX Import options.