There are plenty of synonyms for the phrase "create a portfolio," depending on the context in which it is used. For instance, you could say "develop a collection" or "compile a body of work" to indicate a creative portfolio of art or writing. If the portfolio is for a job application, you might describe it as "assembling a professional showcase" or "crafting a career summary." Other potential synonyms include "curate a selection," "gather examples," or "organize a presentation." Whatever phrasing you choose, the goal is to convey the act of gathering and presenting one's best work in a specific format.