To create fees that will deduct the owner's commission calculation basis, simply mark the option below in the configuration of an additional fee:

By making this adjustment, the fee will be present in the booking forwarding mode and will influence the final calculation of the owner's credit for the booking, as shown in the example below:

If you work with manual booking forwarding, you will be able to freely edit the amount during the forwarding confirmation.

You do not need to do this for OTA commission fees. If this is your goal, click on the link below.
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Now that you know how to configure fixed fees for forwardings to owners, be sure to check out other configurable fee models on your