What is the Attribute List Management tab: page edit the of per To access the Attribute List Management, head to the Admin Center and head to the Administrative List Management section to the Attribute List Management tab. The Attribute List Management window will allow you to choose a data layer that you wish to access and then each individual attribute from said data layers. 
be shown the values for each attribute and they will appear in 3 columns. First you have the List Value column that shows what will be displayed in the list. Finally you have the Usage Count column that You also have the Sort Value column for attributes that are that will show how the list values will be sorted in the list and Rating columns for attributes such as Condition that have an iTree 
Overview
The Attribute List Management
section allows a user to view, add, edit and
delete list values
for each custom attribute
in an individual data layer.
Adding to the Attribute List:
You will start by specifying the Data Layer, then choosing the Attribute whose list you want to manage.
This is used for both i-Tree Eco benefits and valuations.
Actions – this is where you can A: edit a list value, or B: delete a list value.
Adding a List Value
To add a list value, navigate to the attribute you want to add the list value to as described above, and click the 
button at the bottom of the window.
This will bring up the Add List Value form, where you will fill out certain fields as described above.
Click Save when you’re done filling out the form and you will have a new value in your attribute list!