Hello ,
For those who don’t know there is an ongoing votation about this new feature in ibkr .
I suggest to vote it in order to have this in the future 
Links:
You can also reach clicking on “ help “ and new feature poll
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I am sure there was already a thread about it, but I can’t find it now.
I will upvote it despite I do not need it.
I just state the value of the whole porfolio and add the statements. Was never an issue.
But you are all right, stating each transaction is the correct way to fill out the tax statement.
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