The usual way to make a C-print from a transparency with traditional methods is to make an internegative of the slide, ideally on a low contrast dupe film designed for the purpose, usually of a larger format than the original transparency.
Elsewhere around here, PE describes a method of reversal processing for C-prints, which is another possibility.
You can the slide and give the photofinisher a digital file, I do this routinely for prints from transparencies. The other choice is to send it to a lab still doing Ilfochrome.
If you mean print a slide and get a negative print, just use color paper directly. The effects can be quite amazing. It results in an cross-exposed print.
The other way is to make an internegative on Portra VC and pull process by about 15" in development. That is about ISO 100 and not 160. This gives an excellent internegative for printing.