The phrase "adds another role" is correct and usable in written English.
You can use it when discussing the addition of a new function or responsibility to a person, group, or system.
Example: "In this project, she adds another role by taking on the responsibilities of a team leader."
Alternatives: "introduces an additional role" or "incorporates another function".
And Ms. Jarrett has added another role to her portfolio, traveling to swing states to campaign, sometimes at Mr. Obama's side.
In the past few years, the still vibrant Peres has added another role to his statesmen hat: entrepreneurial advocate.
And Webb just added another role to his resume — author — to help other people better forge their own successful work lives.
When I went in for the callback, which was with the director, Amy Heckerling, and all the producers, I remember they actually added another role for me, so I read also for the role of Heather, Josh's girlfriend in the movie.
Hardy meanwhile adds another heavyweight role to a roster of psychopaths including Charles Bronson and Bane from The Dark Knight Rises, as well as the Kray twins in a forthcoming film.
This adds another important regulatory role for Reg1 in glucose-induced signaling, in addition to the previously described recruitment of the PP1 subunit Glc7 to Snf1, the inactivation of maltose permease and the degradation of fructose-1,6-bisphosphatase in the vacuole.
We suggest that, in vivo, some Zn ribbon domains might also bind iron and therefore possess an electron carrier activity, adding another physiological role to this large family of important proteins.
So seeing Ms. Knight take on what is essentially the Page role adds another reverberant sound to the echo chamber that is "Masks".
The work presented here adds another dimension to the role of ENPP1, and supports the hypothesis that ENPP1 may act as a natural modulator of insulin signalling in the liver.
By exploring the role of YY1 in migration and invasion, our study adds another layer to the complex role that YY1 may play in the development of metastatic disease.
