What happens if a credit card deposit in Venn includes multiple transactions as a single lump sum? Can it be synced with multiple invoices in QuickBooks Online (QBO)?

When a credit card deposit comes in as a lump sum in Venn, it will be recorded the same way in QBO when synced. If you need to match it to individual invoices or credit card payments in QBO, you will need to do so manually within QBO.