When you setup your lexoffice integration with Pleo, we will automatically create a bank account within lexoffice that represents your Pleo wallet.
When you make a purchase with your Pleo card, we will automatically sync that transaction to lexoffice. When you have exported the expense to lexoffice, you can reconcile the account transaction with your expense.
See here how you export your expenses to lexoffice.
Note: the transaction will first show up in lexoffice when it has been settled in Pleo. Read more about how that works here.