As you know, in SolidWorks you can put a part into the part. However, so far it could only be a file in the format of parts.*SLDPRT. I will not write on this occasion and the use of such an action, There are several of them. But I will write about the new possibility. Currently, you can insert in addition to native SW files also imported files in formats: *.sat, *.step oraz *.igs.