How can I convert large stp file into solidworks ?

Hello Ramouz,

SolidWorks nowadays has two modes for importing STEP files:
1. 3D Interconnect switched ON
2. 3D Interconnect switched OFF

Since it is a large STEP file, I expect 3D Interconnect to accelerate initial opening of the STEP file. But if you want to adjust the geometry, you should then save the model and then RMB + Dissolve.

However, depending on the size of the STEP file, it will take a long time to load regardless. If your STEP file is 500 MB you should expect more than 10 minutes loading time, easily. I Have seen STEP files of 1.5Gb open in no less than 30 minutes, usually more.

The factors to speed up STEP file opening:
-Have the STEP file on your local disc, not on a network location or external drive.
-Have enough RAM and a fast CPU (high single thread performance, mostly).
-Use SSD drives, not HDD drives. Preferably with NVMe instead of SATA interface.

Finally, in Tools > Options > System options > Import, don't have 'Import sketches' switched on.

Other than that, there is not much else you can do. Just try and open it, and go get something to drink...

Regards,
Elian

Yahya... Same thing.