How to save assembly in IGES/STEP formate in CATIA v5?
Steps I taken-
1.inserted all parts
2.assemble them all
3.save the file in igs format
after saving, assembly was saved in the form of part
IGES (.igs) file does not save the file an assembly. I would recommend saving it as STEP (.stp) file.
Answered with a tutorial: https://grabcad.com/tutorials/how-to-save-assembly-in-iges-step-formate-in-catia-v5
Another possibility is to Generate CATPart from Product... see the tutorial.