XCOPY is deprecated. It has been replaced by ROBOCOPY.
Open a command prompt window an run robocopy /? for help on command ROBOCOPY. In comparison to help of XCOPY output on running xcopy /? it has the option /XF to exclude one or more files specified after this switch and it is even possible to use wildcards.
So the command you might use is:
%SystemRoot%\System32\robocopy.exe C:\AA D:\Models\Broker\NB\MOTNB0056 /E /XF C:\AA\FileToExclude.ext
Some additional notes:
/S means copying with subdirectories, but without empty directories.
/E means copying with subdirectories with including empty directories.
It does not make sense to specify both on the command line.
It is advisable to specify target directory with backslash at end. This makes it clear for ROBOCOPY as well as for XCOPY that the target string specifies a directory and not a file. This is important in case of just a single file is copied as you can read in answer on batch file asks for file or folder. Both commands create the directory tree to target directory if this is necessary on having target directory specified with \ at end.
See Microsoft's documentation on Windows Commands and SS64.com - A-Z index of the Windows CMD command line on searching for a command for a specific file operation from command line or batch file.