Hi JR,
Is daytime again - so pulled out some useful links for you
- changing order status:
http://forum.x-cart.com/showthread.php?t=33007
- changing order status and e-mails sent to customers:
http://forum.x-cart.com/showthread.php?t=13337&page=6&highlight=order+stat us
- understanding how stock is handled when order status changes:
http://forum.x-cart.com/showpost.php?p=209953&postcount=3
In regards to selecting multiple order statuses at the same time / once - you could adapt this post to work for V4.1.X (note code in V4.0.XX chain is a little different - so will need changing) - see
http://forum.x-cart.com/showthread.php?t=14911&highlight=select+multiple+o rder+status
Otherwise perhaps take a look at the code for how this is done for selecting multiple categories for a product on the admin products page (you should be able to adapt that I would have thought).
Hope comments are useful - cheers, Asiaplay