You can re-categorise a transaction to one of CashNav's pre-set 'Wants', 'Needs' or 'Other' categories.  You can choose to apply the new category just to this transaction, or future transactions as well. 

CashNav's 'Other' categories are used to track transactions that you do not want included in your spending meter or spending graphs.  The 'Other' categories are: gifts, donations, taxes, account transfers, business expenses, income, investments, payments and untagged (uncategorised).