Feature recognition from STEP203 or STEP214 files to build solid model?
Open Solidworks. Press CTRL+O (open file shortcut). Next to filename, you will see All Files as selected option. Click on it and menu will popup. Select STEP AP203/214 in that menu. Click on "OPTIONS" located above of file type selection field. Import Options dialogue box will appear.
Now make following changes ;
Tick Try forming solids and B-ray Mapping.
Tick Import multiple bodies as parts.
Now Click OK.
Locate your STEP file through Open File Navigator and click open.
If your STEP is single body then it will open as a part otherwise it will generate assembly.
For Part file, use feature recognition in solidworks and convert it into editable model. You will need to manually assign required dimensions, constraints and relations to the sketches of newly formed part body.