SAN FRANCISCO — More.com has partnered with New York-based Cosmetics Plus in an effort to provide online shoppers with a broader assortment of beauty care products. The two companies expect to launch a Cosmetics Plus online beauty emporium, cosmeticsplus.com at more.com, in the fourth quarter. The companies will jointly develop the site, but cosmeticsplus.com will remain a separate brand entity featured as more.com’s online beauty store.Through cosmeticsplus.com, more.com will provide its customers access to more than 32,000 beauty items, including prestige and exclusive label beauty products.