How to change mass transfer, adjustment ,retirement posting status as 'Delete'

Summary:

Hi When I use UI page to do mass assets transactions, such as "Transfer ,Adjustment, Retimrement"

I will create a transaction group. Then choose parameter to generate a group data of transaction, the posting status is In progress. After I did the change and post the transaction data, This transaction group posting status will be changed into Posted.

But If I want to delete this transaction group in progress status, How can i do, I just can change the data status in spreadsheet into delete. But can't delete this tranaction group. So could you please anyone tell me what's the meaning of 'Delete' in the posting status list.