Yes, it is possible using the
This is described in Combining MSnSet instances section of the MSnbase: MS data processing, visualisation and quantification vignette. You can access it from R by typing
vignette("MSnbase-demo", package = "MSnbase").
You can access it online here. Note that the online vignette matches the development version (but that section/functionality hasn't changed), while the one accessed directly from R matches you installed version.