Adding an Inventory, Edit Pending Inventories

You can navigate to your pending inventories in the following ways:
Click on "Edit Inv" below the item number to access the Edit Inventory page.

The tools to Add an Item, change Source, edit Note and Delete this Inventory are located at the bottom of the inventory page.

The options to Delete Item, change Quantity, change Match ID, add as Extra and change the Regular/Extra/Counterpart/Alternate flag are located in the inventory list by each item.
Inventory Comparison Tool
Use the Inventory Comparison Tool to check which Items are missing, might be wrong or need to be checked.

Tool: Inventory Comparison Tool.
Help Page: Help Page Inventory Comparison Tool
Add Extra Items
You can add extra items at the bottom of the page, but the easiest way is to Sort Items by Item No and add the quantity of extras in the EXT column.
Change Item
The only way to change an item is by deleting the incorrect item first (check box Delete column) and add the correct item at the bottom of the page.