I have to export and assembly as a STEP file. Within the assembly there are some sub-assemblies that have various configurations

I exported to a STEP 203 file format, it asked me if I wanted to resolve hidden or suppressed parts/assemblies.

I selected no.

It exported fine. I then imported the step file to check that all was ok.

When it had finised I noticed that one of my subassemblies that has various configurations was showing the other configurations that were suppressed in the original assembly.

How do I stop this happening? I'll attach a picture later to more easily demonstrate.