How to add a column in OTBI Analysis summing up values of two other columns

Summary

I am working on OTBI analysis, where I need to show a column which will sum up the values of two other columns at row level.

Content

Hello,

I am working on OTBI analysis using "Payroll - Element Entries Real Time"."Element"."Element Name", "Payroll Run Results"."Run Result Value" and "Payroll - Element Entries Real Time"."Input Value"."Input Value Name". The idea is to show the run_result_value generated for an element_name and input_value for a particular payroll period. 

The requirement is to show a column which will sum up the values of two other columns at an employee level as shown below.