How to remove transactions from Contacts so I can delete them?

How to remove transactions from Contacts so I can delete them?

I downgraded my plan and can only have up to 50 contacts.  I need to delete ~185 contacts.  However, before doing that I need to delete all transactions and all reconciliations tied to those transactions.  I'm noticing that even when I am able to delete transactions, the contact still will not delete due to transactions somewhere being associated.

How can I remove my inactive contacts so I can begin using ZBooks again??

Many thanks!

Brian