In case you would like to load an adicional to an existing booking, you should follow the following steps:
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1. Enter the booking of reference
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2. Scroll down to the "Additional" sector and click on the pencil to edit. By clicking on the pencil, you will be shown with the enabled additional options for that booking (according to the car and branch office of the booking)

3. Click on the Additional that you need to add. Check that it has an orange color (meaning it is selected) and click on Save (at the Additional section)
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4. Once it has already been selected and saved, the new additional will be shown at the price and update the value.
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In case you do not have permission to proceed with this transaction, inform your administrator so he can enable you the "Can Administrate Additionals" permission.