Can i recode GST and/or categories the transaction to a different account after the completion of Bank reconciliation?

Hi userabinishas, 

Once you finalise a Reconciliation it will consider the transaction detail amounts as verified and belonging to the opening/closing balance. For the system to prompt that the Reconciliation has changed will be in regards to the balances changing, which includes categorising the transaction to a particular account outside of the original bank account or the amounts themselves.

If you are just changing the expense type or income type, this will not affect the balance. If you are recoding the GST , just be aware that the amount does not change on the reconciled amount, and the Reconciliation screen will not prompt that the balance has been changed and to redo the period. 

Hope this helps, 

-Steven