Please .... don't use phenol (carbolic) in your soap as a fragrance. Phenol is absorbed into the body through the skin and respiratory system and the liquid and vapors will cause serious chemical burns.
Phenol was used as a disinfectant at a time when there were no disinfectants that were safer to use and the risk of serious infection was greater than the risk from using phenol. But things are quite different nowadays, which is why phenol is no longer used in Lifebuoy and other soaps, at least in the US.
Although I realize tiny amounts of phenol are still added to some consumer products, that is no justification to use this chemical as a fragrance in soap. Even if the % of phenol in the finished soap would be reasonably low-risk for use on the skin -- and that is very much a questionable point in my mind -- you would have to handle the more concentrated solution while making the soap and increase the risk of a potentially toxic exposure.
I respect lye as a chemical to use with care and proper safety equipment. Phenol is a step beyond lye IMO, if for no other reason than the hazardous nature of phenol remains intact in the finished soap, whereas the hazardous nature of the lye does not. I would not work with it unless there was a very, very good reason AND I had the proper safety gear and equipment to work with it safely.