Complete the following fields:
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* Validates stock - If the additional refers to a limited quantity article, enable this option.

* Price per day - Select if the additional has a price per day, otherwise set a unique value that wont vary depending on the amount of days.
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​* Price strategy - Establish a strategy for the price of the additional, the options being:

- Fixed Price - Standard pricing.

- Price based on Booking- Complete with a percentage value, this will calculate the price based on the price of the booking.

- Price based on the Category of the car - Complete with a percentage value, this will calculate the price based on the price of the 0km car category.

- Price based on the Model of the car - Complete with a percentage value, this will calculate the price based on the price of the 0km car model.
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​* Maximum amount per booking- Establish the maximum ammount of additional available for a single booking.
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​* Type - Select if it correspond to an Additional, Insurance or Other.

* Valid for Models- If left blank, the option defaults to be available to all models. Select a specific model to make it exclusive.
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​* Valid for Branch Offices - If left blank, the option defaults to be available to all Branch Offices. Select a specific Branch Office to make it exclusive.
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​* Maximum Amount of Days to Charge - Refers to the maximum amount of days for which the additional should be charged.

* Modifies Guarantee - Select in the case of having this additional (generally refering to Insurances) discount the price of the guarantee.
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​*Modifies guarantee for rollover - Select in the case of having this additional (generally refering to Insurances) discount the price of the guarantee for rollover.

​*Modifies guarantee for damages - Select in the case of having this additional (generally refering to Insurances) discount the price of the guarantee for damages.
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​*Modifies guarantee by theft - Select in the case of having this additional (generally refering to Insurances) discount the price of the guarantee by theft.
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​*Modifies price - Select in the case of having this additional discount the price of the guarantee of the booking.
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​* Important - Select for this additional to be shown on the Dashboard as a star in the reservation.
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​* Available for external systems - Select for this additional to be available in external systems such as the web page.
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​* Required - Select for this additional to be required in all bookings, this means the additional wont be posible to remove.
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​* By default - Select if you wish for this additional to be applied to all bookings, this option still allows for the additional to be removed from the booking.

* Excluded Additionals - When another additional is excluded, both wont be able to be selected on the same booking. It is possible to exclude more than one additional.

* Excluded Taxes - When a tax is excluded, these wont be counted in the percentage when adding taxes. It is possible to exclude more than one tax.

It is important to adress that everything that is shown below the line will be shown on the web.
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