Issue title: Auto Creation of Account Number when adding child in chart of accounts
 Issue body: Hello Dear,

My request is that when we try to addchild then in new account window account number should be carried from the parent. suppose if i am adding child of a root account with account number 11 then in its child 11 should come automatically in account number of child account 
 Comments: 
 Comment 0: Kindly create a new issue if the said feature/request/enhancement is not yet included after v13.10.
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