Is it allowed I create Gig in different category and subcategory ?? I am new and I am confused to create a gig in different category and subcategory and is it fine to use the same description with few changes in services ??
You are new and already thinking fraudulently, which is worrying.
All gigs need to be unique. Fiverr will remove duplicate gigs and possibly give you an account warning.
If you search the forums you will see that time and time again sellers who try and act in a deceitful way to try and trick the system don’t win.