Add an account to hold investments

[Sandip P. Deshmukh]

Here is my problem:

Start Gnucash -> New Account Hierarchy -> Investment Accounts -> Finish 
creates:

(Account Name: Security/ Currency : Placeholder : Account Type format)

Assets : USD : Placeholder : Asset
  -  Investments : USD : Placeholder : Asset
    - Brokerage Account : USD: Live : Bank
      - Bond : USD : Live : Stock

In this Bond account, I can create multiple securities, say an AMZN 
security containing AMZN stock, etc.

But when I try creating another account similar to Bond at a same 
position (child of Brokerage Account), I can not select Security/ 
Currency as USD and account type as Stock.

How do I get that done?

Thanks for your help in advance.

-- 
Sandip P. Deshmukh