Can we add STUD in creo IFX library

I suppose the workaround is to create it manually as you would with any other part. Once you've assembled the first instance you could add the rest using Pattern and the studs will be auto-placed in the holes you've made with Pattern in the main part.

Hi,

you can find information in Creo Help Center.

https://support.ptc.com/help/creo/creo_pma/r9.0/usascii/index.html#page/assembly/intelligent_fastener/To_Add_New_Fastener_Type.html