More properties on a manufacturer part

How can there be added more properties on a manafacturer part in SOLIDWORKS Electrical?

1. Open - Manufacturer part management
   
   
2. Select at random part - and go into properties.
   
   
3. Select Customize... 
   
    
4. Create a new data by using Insert user data - below there is created a new property called "New data".
   
   
   
    
5. Click OK - and it will be added as a standard property.
   
   
   
   
   Please note - when you return back at the manafacturer part, it will not be showing. The property dialog need to be closed and opened to be updated with the new property.
   
   
   
6. The New Data property is now avalible.