You do not add field catalogue to pricing procedure.
You would be adding fields to field catalogue. These fields are then added to access sequence. Access sequence is assigned to condition type. Finally condition type is assigned to pricing procedure.
Please go through this link which provides detailed information about adding fields to field catalogue.
[Add New Fields To Field Catalog |http://www.sap-basis-abap.com/sd/how-to-add-new-fields-to-field-catalog.htm]
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