This will be solved when you will be able to see payslip line items across all payslips at once and Group By function is implemented. So you can group all those line items by Item and Employee and then get totals for each pair.
I am categorizing this under ideas. There is a similar report titled Pay-slip Totals per Item and Employee. The primary improvement required is to present the report in a columnar format rather than its current long, vertical layout. Adding an option, such as a button, to transpose the report into a columnar structure would significantly enhance its usability and readability.
I tried to use pivot tables to change the form but failed.