Is there a way where i could pre-assign a location to an item in NAV 2015.

GAROE

Am trying to predefine location to my inventory items in NAV. So whenever i purchase or requisition it, the inventory location would automatically be pick up in the item journal.

mohana_cse06

I don't think there is any standard feature for this.
you can customize it by adding a field in Item table and flow it to Item Journal each time when you select the item