In the NetSuite there is function to assign an chart of account to an item record.
Create Chart of Account under;
List > Accounting > Accounts > New
In the Name filed enter the name for COA
Select the Account Type, Currency and Subsidiary. Click Save button.
Create an Item record to assign the account
List > Accounting > Items
Given the Name and other required fields.
In the Accounting subtab select the Account that need to assign. Click save button to save the item record.