Symbols are referenced using symbol in double quotes:

"/GCL" / 2

User defined formula references

Existing user defined formulas can be referenced within an expression or other UDF definition.User defined formulas (UDFs) are referenced using @ followed by the udf name, quotation marks are not required:

(@MY_CRUDE_STRIP + @MY_GAS_STRIP)/2

Most recent value symbol qualifier

mrv(symbol)

example

mrv("/GCL[0]")