In the invoice view section there are different actions that you can perform on a particular invoice. Please click on "…" that you can see at the end of each invoice listing. Here you can see the option to 'Mark Payment'. On clicking here a pop-up appears where you can choose the mode of payment (Offline/Online).Click on Online/Offline based on how the payment has been made. Now, you can select and tag the amount with the invoice to which you wish to tag the payment

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