This is not a feature in osTicket at this time. You can probably edit the files and remove it that way though.

fnzr,

The file you want is ->ticket.open.inc.php. At line 278, after the <tr>, type this in:
<? php /* (Not sure if the code will come out on the post)

and at line 296 before the <tr>, type this in:
*/ ?>

This basically comments out the code that displays the SLA plan. Since the SLA plan field does not require a response from the user (I am not 100% sure on that, I just know I do not have to enter anything in my installation) it will still work.

I literally just did this and tested. Works for me.

fnzr

I made a general reply to your "SLA hide" issue. I'm not very good at forums so I am sending this one with additional info on it. I did NOT test the rest of the files or code for the SLA field. So while the code I provided on this discussion was for the specified file, I do not know where else this field pops up at, simply for the fact that I didn't look for them.

-WIz