A shortcut key is the INS (Insert) key. Also you can either right click in any list and select Insert or hit the Add button from any list.
Adding records throughout I.C.E. is the same and is very simple. Just fill in the blanks and press save. The are some fields that are required. Those fields are colored in yellow in the form. Additionally you will not be able to save a record until those required fields are complete.
Requiring certain fields to be completed checks against a blank record to be added and makes sure you have at least entered the necessary info to provide to insurance companies.
More on the required fields (yellow highlighted fields)
In order to protect the your inventory from accidental deletions a relation between certain files must exist. This is the reason for having to chose the three critical pieces of data from the Pick List. An item record once entered can be deleted. However, records for the Categories, Item Names and Location files can not be deleted unless the Item record using the category, location or item name is deleted first. Example: (Lets assume you have 10 records using the location of "Master Bedroom") - and while you are in the Location list and have the Master Bedroom record highlighted, you accidentally hit the delete button and hit the confirm the deletion of the Master Bedroom location. I.C.E. will not delete that Master Bedroom record from the Location list because it sees that you have items stored (kept) in the Master Bedroom. I.C.E. will instead tell you that due to a "referential integrity" it can not delete the record. Thus eliminating the possibility of deleting the Mater Bedroom record and leaving your 10 item records with no location as to where those items are stored.