Hi All,
I general Dialog List field we give option that “Allow value not in list” , so that user can add new value in list , i want same thing in Pick List , so is this possible to do this if yes then how if no then what is the alternate option , as i have problem that it show in dialog list that “List value can not more than 65535 elements when search” so this problem is solved by pick list but only one problem that user wants to select new value, ho this possible?
Subject: Allow value not in list is possible in Pick List
As far as I know that is not possible.
So you have to figure oout another way to do it. If you are a programmer, that should not be that hard, solving problems and thinking outside the box is what we do all day, right? 
I would add an option called “Other” to the picklist. If that is selected, a separate text field is being displayed where the user can enter the new value.
You then have some code in PostSave that moves the value in that field to the picklist field (and clears the “other” field).