I have machine assembly in. Stp file how can I save each part speratly in. Prt format in nx

When you open the assembly file, the parts will be created in .prt format in the same folder.

Once you imported the model, when you save it, it will be saved as .prt.

you have to open your Nx software then open file menu then select file type -step then locate step file ,select the step file and open it . it will open and save it as a prt file format