If you bring them in as IGES files then all you will get are dumb solids. Meaning
no features and no dimensions. Depending on what the parts look like featureworks
works best on straight forward machined type parts. Doesn't work well with curvey surface
If the files are coming from Catia directly then you can open them up directly in Solidworks.
You still wont end up with dimensions, but at least you will have features that
you can go through and dimension.