Creating Shortcuts

[Andrew Neil]

Is it possible to create a shortcut for a particular command that one intends to
use frequently within a single .ly file?  
I would like to use cross noteheads often and intermixed with ordinary 
noteheads.
 The appropriate \override and \revert commands are quite lengthy.  It is not so
much from the point of view of text entry (which is easy enough with 
copy-paste),
but to improve the end readability of the .ly file.  
Thanks in advance.
Andrew Neil