There is no way to unlink ProConnect and QBOA.  It is an automatic link due to the ability for Quickbooks users to utilize Proconnect for Prep for Taxes.  However, if you do not actually have a Proconnect account you simply would just not access anything.  It does not affect your Quickbooks account in any way as they are separate accounts internally within our system.  If you have further questions or need more assistance with deleting your data, please contact Quickbooks support line if you are not a Proconnect user at all.