I have a .stp file that I have been able to successfully import into SolidWorks, but there is a problem.  It is an assembly with almost 300 parts and when I imported it they all went into one SolidWorks part file, not an assembly.  They are listed individually as "Imported 1, Imported 2, etc" similar to features would be.  Is there any way for me to get these to be individual parts in an assembly file?

Thanks in advance for your help!