If you want to select and remove multiple lots of a security, you should be able to
Out of curiosity, why do you want to do this? There may be a better way to accomplish what you want.
So you don't want to remove the lots and preserve their history in the account, you want to delete the transactions that added the duplicates in the first place.
To do this, back up your data just in case, then click on the gear at the top right of the account and select Edit multiple transactions. Select the duplicates and hit the Delete button.