You can use Company Info and Custom Fields in Calculated, Query-Edit, and SQL Query of Numeric, Integer, Text fields.
The format is:
@:Y1, @:Y2, etc. for Custom fields.
If you want to use any Custom fields as numeric values in expressions, use @:NY1, @:NY2, etc. (N means Numeric).
Enter tax value into the Custom 1 Field (7.5). Use Info to enter explanation about the value. In the Designer define TAX_RATE = @NY1
TAX_RATE = 7.5 %, TAX = SUBTOTAL * TAX_RATE
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