Gustavo, Contributor posted:1- time- and cost-saving manner [. . .]
Of all the options above, I prefer (1). Perhaps David, our moderador, can tell us what he thinks or knows about this issue.
Hello, MaaAdjoa, and welcome to GE!
I agree with Gustavo's answer and, like you, share his preference for (1). The hyphen after "time" in (1) is sometimes referred to as a suspensive hyphen. Another option is to use a relative clause:
4- a manner that saves time and money
I'm not saying that I prefer (4) to (1). There is a good chance that I would use (1).