# Extra fields
In addition to the fields that you create in the fields section, the module provides a number of other fields that you can use in your formula as well as in your php codes.
To access these extra fields, click the show more button in any formula panel
The fields will be displayed like this
The following is an explanation of each section
# PrestaShop fields
The original product price without taxes and without reductions
This price may contain the current combination price impact
The original product weight including the selected combination weight impact
The quantity selected by the customer
# Product attributes
This section will display the list of the attributes that are used by the current product combinations
The value of each field will contain the current value of the attribute that is selected by the customer.
The attribute names are prefixed by
attribute_ and are transformed to lowercase and any accented
characters or symbols are removed in order to comply
with fields names rules.
This section will be displayed if you have csv files in the
databases data folder.
Check the Grid function documentation to learn more
Similar to the attribute names section, this section will display product features. The value of each field will contain the value of the corresponding product feature.
# Hidden fields
The module provides a field with the name
changed which holds the name of the field that the
customer changed in order to trigger the calculation
This field is also available in php, via the variable