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Basic Steps for Creating a Weapon in the NWN2 Toolset (from Steam):

1. In the Toolset / Map Editor, click the Blueprints panel.
2. Select the Items section.
3. Browse down through the existing global items to locate a starting version of the weapon.
4. Right-click that item and select Copy Blueprint (module).
5. Click the Module listing.
6. Browse through the directories to show the item you copied.
7. Right-click that item and select Item Properties (New Window).
8. Edit the item as needed, including changing the Tag, ResRef, Name; the item type; and other properties (like attack bonuses or damage bonuses).
9. ​NOTE: Pay attention to the ResRef - this is the number needed to easily use DebugMode to give the new item to a character.
10. Close the Item Properties window.
11. Right-click the modified item and select Save File.
12. In the Save As... dialog box, navigate to your My Documents folders and select the Override > Blueprints folder.
13. Name the .UTIL file and click Save.

Now you have a new global item.