Hi Alex,
There isnt a way to set a grid filter to compare the values in two columns.
If you did need to set a grid filter where Column A > Column B for example, you could create a new integer field, Column C, on this table, and populate this field using a loop through table action which performs some basic calculation like Column A - Column B. This would leave you with either a Positive Integer (ie Column A > Column B) or a negative integer (ie Column B > Column A) . Finally, you would then set the Filter to display only values where your created Column C is greater than 0.
Ill do some more testing and see if I can come up with anything else.
Thanks Alex.
Regards,
Ben