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You can automatically determine if GST should be calculated on an item and calculate the GST by using the following technique:
This example assumes you are adding this functionality to a [[UTA]] level and three existing [[Custom Fields|custom fields]] :'''total''' - a text box to store the amount and '''GST''' - a select one combo box to indicate if the item should include '''GST'''.
1. Create an additional [[Custom Fields|custom field]] - '''Calculate GST''' as '''Special - Browser Script''' type field.