Pls Follow the Below Steps for Custom Column in Reports:
Step 1: Click on Custom Column Option
Step 2: Mention the Format Name
Step 3: Click on Add New Column or Add New Row
For New Column :
Step 1: Mention the Heading, Position ,Data type Field and Alignment as per your need.
Step 2: Select the Field Value - Data field , Formula Based and SQL Query
Step 3: Select the Category and required field.
For New Row :
Step 1: Enable the sub details option
Step 2: Mention the Show After and Column Field, For when should show and under Which Column.
Step 3: Select the Category, Column Name and Required Field.