<p>Many times I use 'mqsc' for create MQ queue manager from script files but I don't know how to generate script files.</p>

<p>Thanks</p>

There is a SupportPac that installs a program called "saveqmgr.exe".
Here's a link to the download of the Pac:
http://shrinkster.com/17kc
IBM seems to frequently reorganize its website, so the above link might not work if you check back here after a long while, but the SupportPac can be found easily by doing a search for "saveqmgr" on the Websphere MQ page.  Hope this helps!
IBM has this to say about the SupportPac:
Abstract
This SupportPac (saveqmgr) saves all the objects, such
  as queues, channels, etc, defined in a
  either local or remote queue manager
  to a file.
Download Description
This SupportPac interrogates the attributes
  of all the objects defined to a queue
  manager (either local or remote) and
  saves them to a file.
Possible Uses
The format of this file is suitable for use with runmqsc.
  It is therefore possible to use this
  SupportPac to save the definitions of
  objects known to a queue manager and
  subsequently recreate that queue
  manager.