You can track expenses and vendor invoices / payments OFF BUDGET, meaning you can add an “invoice” that you want to track to a vendor record, and opt to not sync it to the budget, yet still enable things like payment reminders.

To track a vendor expense off budget, you'll need to add the invoice via your Contacts Manager.  
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Visit your Contacts manager and add the respective vendor to your wedding by clicking on the ADD TO CONTACT button towards the top left of your screen.   

You’ll be provided the option to add an invoice to track – just be sure to click the OFF BUDGET option for the invoice you’d like to track.