Using temporary fields during calculations
If you execute several steps during the one operation, and you want to use the results of one step as input for the next, you have to use temporary fields. Temporary fields are created by the system and are only available for the duration of the current Calculate function. You can use up to ten temporary fields.
The temporary field names consist of two characters: the hash symbol (#), followed by a number from 0 to 9. You do not have to define them anywhere. Their default value is 0.0.