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I'm a new user on Solidworks and I joined this site. But the the parts in the files which I downloaded from tihs site are imported so I'm not able to see the how to draw a part on design tree. How can fix this problem?
You can only add a feature to the STEP/IGES files (in case Assembly is converted into part too.)
unfortunately, it's not possible to view features when the model is saved in step, igs, stl ...
when you open files in solidworks that have above formats, you have a feature recognizing wizard that in most case won't give you a good results
try downloading models that have solidworks format.